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 A374871 #5 Sep 11 2024 13:36:14
%S A374871 1,2,12,216,13440,3600000,5137292160,46921886323200,
%T A374871 3202231533127925760,1864324101234676309401600,
%U A374871 10395949648645451956665600000000,615427797319269256611285148820828160000,424360339875987535547553745155503616043253760000
%N A374871 Obverse convolution (n)**(n!); see Comments.
%C A374871 See A374848 for the definition of obverse convolution and a guide to related sequences.
%t A374871 s[n_] := n; t[n_] := n!;
%t A374871 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374871 Table[u[n], {n, 0, 13}]
%Y A374871 Cf. A000027, A000142, A374848.
%K A374871 nonn
%O A374871 0,2
%A A374871 _Clark Kimberling_, Aug 28 2024