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 A363775 #14 Jun 22 2023 07:20:26
%S A363775 1,-3,6,-10,12,-9,-2,24,-54,80,-84,42,66,-234,420,-536,450,-39,-740,
%T A363775 1770,-2688,2898,-1722,-1320,6078,-11349,14736,-12992,3084,15999,
%U A363775 -41212,64032,-70788,46020,20778,-126132,244120,-323421,295410,-96848,-293868,815829,-1297972
%N A363775 Expansion of 1/(Sum_{k>=0} x^(k^2))^3.
%F A363775 a(0) = 1; a(n) = -(3/n) * Sum_{k=1..n} A162552(k) * a(n-k).
%o A363775 (PARI) my(N=50, x='x+O('x^N)); Vec(1/sum(k=0, sqrtint(N), x^k^2)^3)
%Y A363775 Convolution inverse of A002102.
%Y A363775 Column k=3 of A363778.
%Y A363775 Cf. A162552.
%K A363775 sign,easy
%O A363775 0,2
%A A363775 _Seiichi Manyama_, Jun 21 2023