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 A369372 #7 Jan 22 2024 05:55:53
%S A369372 1,7,85,1437,26707,534513,11255951,245612031,5503639327,125900330437,
%T A369372 2928092906281,69026845135479,1645689594867257,39611576627651927,
%U A369372 961279033420170871,23494000801494204647,577777092945262623161,14287061769367391787065,355010279665452190629001
%N A369372 a(n) is the constant term in expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^3.
%t A369372 Table[Coefficient[Product[(x^k + 1 + 1/x^k)^3, {k, 1, n}], x, 0], {n, 0, 18}]
%o A369372 (PARI) a(n) = polcoef(prod(k=1, n, (x^k + 1 + 1/x^k)^3), 0); \\ _Michel Marcus_, Jan 22 2024
%Y A369372 Cf. A007576, A124995, A156181, A369373.
%K A369372 nonn
%O A369372 0,2
%A A369372 _Ilya Gutkovskiy_, Jan 21 2024