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 A299208 #11 Jan 18 2020 14:03:24
%S A299208 1,1,0,-1,-2,-1,1,3,3,1,-3,-6,-5,1,9,12,5,-9,-20,-18,1,26,38,21,-21,
%T A299208 -61,-62,-9,72,120,81,-44,-177,-205,-64,186,366,293,-63,-496,-657,
%U A299208 -304,445,1084,1014,33,-1341,-2053,-1238,959,3132,3378,770,-3474,-6260,-4619,1656,8809,10929,4306,-8520
%N A299208 Expansion of 1/(1 - x*Product_{k>=1} 1/(1 + x^k)).
%H A299208 Seiichi Manyama, <a href="/A299208/b299208.txt">Table of n, a(n) for n = 0..10000</a>
%H A299208 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%F A299208 G.f.: 1/(1 - x*Product_{k>=1} 1/(1 + x^k)).
%F A299208 a(0) = 1; a(n) = Sum_{k=1..n} A081362(k-1)*a(n-k).
%t A299208 nmax = 60; CoefficientList[Series[1/(1 - x Product[1/(1 + x^k), {k, 1, nmax}]), {x, 0, nmax}], x]
%Y A299208 Antidiagonal sums of A286352.
%Y A299208 Cf. similar sequences: A067687, A299105, A299106, A299208, A302017, A318581, A318582, A331484.
%Y A299208 Cf. A081362, A299108, A299162, A299164, A299166, A299167, A299209, A299210, A299211, A299212.
%K A299208 sign
%O A299208 0,5
%A A299208 _Ilya Gutkovskiy_, Feb 05 2018