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Simplifying this Euler series

What would be the simplification of a(n)=floor(1e)+floor(2e)+floor(3e)+....floor(ne) or a very close approximation? I was thinking of something like e*(n)(n+1)/2 -n/2 but it does not satisfy all the values of n given here-https://oeis.org/A184976

Note by Jerrrr Ksjdd
4 months, 2 weeks ago

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