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 A294581 #9 Nov 04 2017 08:07:50
%S A294581 1,-1,-8,-19,-21,139,448,1414,1206,-3865,-21271,-65257,-116480,-76230,
%T A294581 494952,2082603,5801391,10117600,8498261,-25314504,-144955267,
%U A294581 -405982721,-858529330,-1081275709,126891854,6202698189,22569319856,56419872881,102176753056
%N A294581 Expansion of Product_{k>=1} (1 - k^2*x^k)^k.
%H A294581 Seiichi Manyama, <a href="/A294581/b294581.txt">Table of n, a(n) for n = 0..6927</a>
%o A294581 (PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, (1-k^2*x^k)^k))
%Y A294581 Column k=2 of A294580.
%K A294581 sign
%O A294581 0,3
%A A294581 _Seiichi Manyama_, Nov 02 2017