This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A294501 #11 Aug 20 2018 07:51:31
%S A294501 1,0,2,-1,4,-7,19,-48,123,-304,728,-1694,3865,-8735,19739,-44875,
%T A294501 102818,-236939,546988,-1260023,2888607,-6584008,14927816,-33714166,
%U A294501 75976024,-171095098,385405617,-868708176,1959010348,-4417777937,9957188242,-22420045445
%N A294501 Inverse binomial transform of the number of planar partitions (A000219).
%H A294501 Vaclav Kotesovec, <a href="/A294501/b294501.txt">Table of n, a(n) for n = 0..3000</a>
%F A294501 a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * A000219(k).
%F A294501 G.f.: (1/(1 + x))*exp(Sum_{k>=1} sigma_2(k)*x^k/(k*(1 + x)^k)). - _Ilya Gutkovskiy_, Aug 20 2018
%t A294501 nmax = 40; s = CoefficientList[Series[Product[1/(1-x^k)^k, {k, 1, nmax}], {x, 0, nmax}], x]; Table[Sum[(-1)^(n-k) * Binomial[n, k] * s[[k+1]], {k, 0, n}], {n, 0, nmax}]
%Y A294501 Cf. A281425, A293467, A294500, A294503, A294505.
%K A294501 sign
%O A294501 0,3
%A A294501 _Vaclav Kotesovec_, Nov 01 2017