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 A374881 #8 Sep 27 2024 04:00:30
%S A374881 0,1,16,405,15360,818125,58226688,5332085577,610140160000,
%T A374881 85235284359225,14264819712000000,2815701027697558429,
%U A374881 646960843646287478784,171112492588968115453125,51595090958399913852928000,17587698619968027952119140625
%N A374881 Obverse convolution (n)**(n^2); see Comments.
%C A374881 See A374848 for the definition of obverse convolution and a guide to related sequences.
%F A374881 a(n) ~ n^(2*n + 1) / exp(2*n + 1 - Pi*sqrt(n)). - _Vaclav Kotesovec_, Jul 31 2024
%t A374881 s[n_] := n; t[n_] := n^2;
%t A374881 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374881 Table[u[n], {n, 0, 18}]
%Y A374881 Cf. A000027, A000290, A374848, A376523, A376524.
%K A374881 nonn
%O A374881 0,3
%A A374881 _Clark Kimberling_, Jul 31 2024