Summation formulas for powers 0 to 20 of integers

$\sum _{i=0}^n (i^j) \Rightarrow$

$\begin{array}{rl} 0 & n+1 \\ 1 & \frac{1}{2} n (n+1) \\ 2 & \frac{1}{6} n (n+1) (2 n+1) \\ 3 & \frac{1}{4} n^2 (n+1)^2 \\ 4 & \frac{1}{30} n (n+1) (2 n+1) \left(3 n^2+3 n-1\right) \\ 5 & \frac{1}{12} n^2 (n+1)^2 \left(2 n^2+2 n-1\right) \\ 6 & \frac{1}{42} n (n+1) (2 n+1) \left(3 n^4+6 n^3-3 n+1\right) \\ 7 & \frac{1}{24} n^2 (n+1)^2 \left(3 n^4+6 n^3-n^2-4 n+2\right) \\ 8 & \frac{1}{90} n (n+1) (2 n+1) \left(5 n^6+15 n^5+5 n^4-15 n^3-n^2+9 n-3\right) \\ 9 & \frac{1}{20} n^2 (n+1)^2 \left(n^2+n-1\right) \left(2 n^4+4 n^3-n^2-3 n+3\right) \\ 10 & \frac{1}{66} n (n+1) (2 n+1) \left(n^2+n-1\right) \left(3 n^6+9 n^5+2 n^4-11 n^3+3 n^2+10 n-5\right) \\ 11 & \frac{1}{24} n^2 (n+1)^2 \left(2 n^8+8 n^7+4 n^6-16 n^5-5 n^4+26 n^3-3 n^2-20 n+10\right) \\ 12 & \frac{n (n+1) (2 n+1) \left(105 n^{10}+525 n^9+525 n^8-1050 n^7-1190 n^6+2310 n^5+1420 n^4-3285 n^3-287 n^2+2073 n-691\right)}{2730} \\ 13 & \frac{1}{420} n^2 (n+1)^2 \left(30 n^{10}+150 n^9+125 n^8-400 n^7-326 n^6+1052 n^5+367 n^4-1786 n^3+202 n^2+1382 n-691\right) \\ 14 & \frac{1}{90} n (n+1) (2 n+1) \left(3 n^{12}+18 n^{11}+24 n^{10}-45 n^9-81 n^8+144 n^7+182 n^6-345 n^5-217 n^4+498 n^3+44 n^2-315 n+105\right) \\ 15 & \frac{1}{48} n^2 (n+1)^2 \left(3 n^{12}+18 n^{11}+21 n^{10}-60 n^9-83 n^8+226 n^7+203 n^6-632 n^5-226 n^4+1084 n^3-122 n^2-840 n+420\right) \\ 16 & \frac{1}{510} n (n+1) (2 n+1) \left(15 n^{14}+105 n^{13}+175 n^{12}-315 n^{11}-805 n^{10}+1365 n^9+2775 n^8-4845 n^7-6275 n^6+11835 n^5+7485 n^4-17145 n^3-1519 n^2+10851 n-3617\right) \\ 17 & \frac{1}{180} n^2 (n+1)^2 \left(10 n^{14}+70 n^{13}+105 n^{12}-280 n^{11}-565 n^{10}+1410 n^9+2165 n^8-5740 n^7-5271 n^6+16282 n^5+5857 n^4-27996 n^3+3147 n^2+21702 n-10851\right) \\ 18 & \frac{n (n+1) (2 n+1) \left(105 n^{16}+840 n^{15}+1680 n^{14}-2940 n^{13}-9996 n^{12}+16464 n^{11}+48132 n^{10}-80430 n^9-167958 n^8+292152 n^7+380576 n^6-716940 n^5-454036 n^4+1039524 n^3+92162 n^2-658005 n+219335\right)}{3990} \\ 19 & \frac{1}{840} n^2 (n+1)^2 \left(42 n^{16}+336 n^{15}+616 n^{14}-1568 n^{13}-4263 n^{12}+10094 n^{11}+22835 n^{10}-55764 n^9-87665 n^8+231094 n^7+213337 n^6-657768 n^5-236959 n^4+1131686 n^3-127173 n^2-877340 n+438670\right) \\ 20 & \frac{330 n^{21}+3465 n^{20}+11550 n^{19}-65835 n^{17}+426360 n^{15}-2238390 n^{13}+8817900 n^{11}-24551230 n^9+44767800 n^7-47625039 n^5+24126850 n^3-3666831 n}{6930} \\ \end{array}$