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 A374079 #6 Jun 28 2024 14:01:05
%S A374079 1,-1,1,-1,1,-1,0,0,0,0,0,-1,2,-2,2,-2,1,0,-1,1,-1,0,2,-3,4,-4,3,-1,
%T A374079 -1,2,-3,2,1,-4,6,-7,7,-4,0,3,-5,5,-2,-3,8,-11,12,-9,3,3,-8,10,-7,0,8,
%U A374079 -15,19,-17,9,1,-10,16,-15,6,7,-19,28,-29,20,-5,-11,23,-26,17,1,-21
%N A374079 Expansion of Product_{k>=1} 1 / (1 + x^(5*k-4)).
%t A374079 nmax = 75; CoefficientList[Series[Product[1/(1 + x^(5 k - 4)), {k, 1, nmax}], {x, 0, nmax}], x]
%t A374079 a[0] = 1; a[n_] := a[n] = (1/n) Sum[DivisorSum[k, (-1)^(k/#) # &, Mod[#, 5] == 1 &] a[n - k], {k, 1, n}]; Table[a[n], {n, 0, 75}]
%Y A374079 Cf. A081360, A081362, A109697, A280454, A284314, A374064, A374065, A374076, A374077, A374078.
%K A374079 sign
%O A374079 0,13
%A A374079 _Ilya Gutkovskiy_, Jun 27 2024