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 A374859 #4 Aug 28 2024 10:56:24
%S A374859 1,4,36,640,21600,1370880,163924992,37150064640,16065713664000,
%T A374859 13343315521536000,21404225432753602560,66631099907380661452800,
%U A374859 404128087449517604339712000,4791300434691082493755392000000,111343541043408070030243833839616000
%N A374859 Obverse convolution (n)**(2^n); see Comments.
%C A374859 See A374848 for the definition of obverse convolution and a guide to related sequences.
%t A374859 s[n_] := n; t[n_] := 2^n;
%t A374859 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374859 Table[u[n], {n, 0, 20}]
%Y A374859 Cf. A000027, A000079, A374848.
%K A374859 nonn
%O A374859 0,2
%A A374859 _Clark Kimberling_, Aug 18 2024