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 A369389 #5 Jan 22 2024 10:42:59
%S A369389 1,3,9,35,141,745,3955,23985,155527,1060941,7393765,53041015,
%T A369389 387815175,2882682967,21715452927,165583974835,1275674593889,
%U A369389 9918184576835,77738274996385,613753581566079,4877383708962749,38989308129231703,313354624116918229,2530796548734844153
%N A369389 a(n) is the constant term in expansion of Product_{k=1..n} (x^(k^2) + 1 + 1/x^(k^2))^2.
%t A369389 Table[Coefficient[Product[(x^(k^2) + 1 + 1/x^(k^2))^2, {k, 1, n}], x, 0], {n, 0, 23}]
%Y A369389 Cf. A047653, A156181, A350249, A350495.
%K A369389 nonn
%O A369389 0,2
%A A369389 _Ilya Gutkovskiy_, Jan 22 2024