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 A375051 #6 Sep 20 2024 02:18:47
%S A375051 -2,1,0,441,75264,14402025,3451797504,1043554187025,392874877255680,
%T A375051 181193143212358641,100757479882752000000,66592039534109652160521,
%U A375051 51648427918242896412672000,46486269540273907302519872025,48078115878910207012782666153984
%N A375051 Obverse convolution (n^2 - 1)**(n^2 - 1); see Comments.
%C A375051 See A374848 for the definition of obverse convolution and a guide to related sequences.
%C A375051 a(2k+1) is a square for k>=0.
%F A375051 a(n) ~ n^(2*n+2) / exp(2*n - Pi*n/2). - _Vaclav Kotesovec_, Sep 19 2024
%t A375051 s[n_] := n^2 - 1; t[n_] := n^2 - 1;
%t A375051 u[n_] := Product[s[k] + t[n - k], {k, 0, n}];
%t A375051 Table[u[n], {n, 0, 20}]
%Y A375051 Cf. A005563, A323540, A374848, A375052.
%K A375051 sign
%O A375051 0,1
%A A375051 _Clark Kimberling_, Sep 15 2024