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 A373121 #14 Aug 03 2024 07:12:00
%S A373121 1,0,2,-2,1,-2,1,2,-2,4,-6,4,-4,0,5,-6,13,-14,9,-10,1,12,-16,26,-32,
%T A373121 24,-19,2,22,-34,57,-64,48,-40,4,44,-70,108,-124,98,-73,6,79,-132,205,
%U A373121 -228,181,-134,13,142,-245,360,-404,330,-230,18,241,-428,630,-694,567,-394,35,410,-735,1054
%N A373121 Expansion of B(x)^2, where B(x) is the g.f. of A230322.
%F A373121 G.f.: C(x) / D(x), where C(x) is the g.f. of A375148 and D(x) is the g.f. of A375149.
%o A373121 (PARI) my(N=70, x='x+O('x^N)); Vec(prod(k=1, N, (1-x^(7*k-3))*(1-x^(7*k-4))/((1-x^(7*k-2))*(1-x^(7*k-5))))^2)
%Y A373121 Cf. A230322, A375148, A375149.
%K A373121 sign
%O A373121 0,3
%A A373121 _Seiichi Manyama_, Aug 03 2024