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 A375056 #9 Oct 02 2024 14:29:12
%S A375056 0,0,0,144,20736,3686400,846720000,248961081600,91903601147904,
%T A375056 41768738415968256,22963973960761344000,15039892634817600000000,
%U A375056 11578453280457231826944000,10356817418502774061032013824,10655399435864041308654755905536
%N A375056 Obverse convolution (n^2 - n)**(n^2 - n); see Comments.
%C A375056 See A374848 for the definition of obverse convolution and a guide to related sequences.
%C A375056 a(2k+1) is a square for k>=0.
%F A375056 a(n) ~ n^(2*n+2) / exp(2*n - Pi*(n-1)/2). - _Vaclav Kotesovec_, Sep 22 2024
%t A375056 s[n_] := n^2 - n; t[n_] := n^2 - n;
%t A375056 u[n_] := Product[s[k] + t[n - k], {k, 0, n}];
%t A375056 Table[u[n], {n, 0, 20}]
%Y A375056 Cf. A279019, A374848.
%K A375056 nonn
%O A375056 0,4
%A A375056 _Clark Kimberling_, Sep 22 2024