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 A374866 #7 Sep 11 2024 13:35:51
%S A374866 2,15,192,3465,80640,2297295,77414400,3011753745,132843110400,
%T A374866 6550564395375,357082280755200,21322087106945625,1384050920207155200,
%U A374866 97036818423709539375,7307788858693779456000,588334230102950937230625,50423743124987078246400000
%N A374866 Obverse convolution (n)**(3n+2); see Comments.
%C A374866 See A374848 for the definition of obverse convolution and a guide to related sequences.
%F A374866 a(n) ~ 3^(3*(n+1)/2) * n^(n+1) / exp(n). - _Vaclav Kotesovec_, Aug 28 2024
%t A374866 s[n_] := n; t[n_] := 3 n + 2;
%t A374866 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374866 Table[u[n], {n, 0, 20}]
%t A374866 (* or *)
%t A374866 Table[2^n*(n+2)*Pochhammer[2 + n/2, n], {n, 0, 20}] (* _Vaclav Kotesovec_, Aug 28 2024 *)
%Y A374866 Cf. A000027, A016789, A374848.
%K A374866 nonn
%O A374866 0,1
%A A374866 _Clark Kimberling_, Aug 28 2024