Partitions with no 1s

p(17)=297p(18)=385p(19)=490p(20)=627p(21)=792 \begin{aligned} p(17) &= 297 \\ p(18) &= 385 \\ p(19) &= 490 \\ p(20) &= 627 \\ p(21) &= 792 \end{aligned}

Let p(n) p(n) be the number of partitions of an integer n n. The values of p(17),p(18),p(19),p(20),p(21)p(17), p(18),p(19),p(20), p(21) are as shown above.

How many partitions of 20 are there that do not contain any parts equal to 1?

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