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