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 A361979 #18 May 26 2023 08:50:25
%S A361979 1,-1,1,-1,1,-1,0,1,-2,3,-4,5,-5,4,-2,-2,7,-13,19,-24,27,-25,17,-2,
%T A361979 -20,48,-80,110,-132,137,-116,62,30,-158,314,-479,622,-704,680,-507,
%U A361979 150,405,-1135,1973,-2797,3432,-3662,3250,-1983,-280,3540,-7592,11977,-15953
%N A361979 Expansion of 1 / Sum_{k>=0} x^(k*(2*k - 1)).
%t A361979 nmax = 53; CoefficientList[Series[1/Sum[x^(k (2 k - 1)), {k, 0, nmax}], {x, 0, nmax}], x]
%Y A361979 Cf. A000384, A006950, A106507, A308806, A317665, A322798, A363149, A363275.
%K A361979 sign
%O A361979 0,9
%A A361979 _Ilya Gutkovskiy_, May 25 2023