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 A307574 #12 May 14 2021 02:53:07
%S A307574 1,-1,-3,-6,-10,-11,3,63,240,677,1622,3415,6277,9485,8917,-9299,
%T A307574 -83683,-309568,-902995,-2315518,-5411355,-11662530,-23117627,
%U A307574 -41317787,-62820880,-65358588,29550902,449154266,1783671567,5453429052,14668699694,36273441659
%N A307574 Expansion of Product_{k>=1} (1 - (x/(1-x))^k)^k.
%t A307574 m = 31; CoefficientList[Series[Product[(1 - (x/(1-x))^k)^k, {k, 1, m}], {x, 0, m}], x] (* _Amiram Eldar_, May 14 2021 *)
%o A307574 (PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, (1-(x/(1-x))^k)^k))
%Y A307574 Convolution inverse of A320563.
%Y A307574 Cf. A073592, A307310, A320564.
%K A307574 sign
%O A307574 0,3
%A A307574 _Seiichi Manyama_, Apr 15 2019