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 A374887 #5 Sep 14 2024 16:45:58
%S A374887 1,4,60,2400,215424,39716352,14347238400,9902131200000,
%T A374887 12892284695347200,31492802074536050688,144165936575856535142400,
%U A374887 1238327694920559152332800000,20010804298085003878056591360000,610343933792029827481169622466560000
%N A374887 Obverse convolution (n^2)**(2^n); see Comments.
%C A374887 See A374848 for the definition of obverse convolution and a guide to related sequences.
%t A374887 s[n_] := n^2; t[n_] := 2^n;
%t A374887 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374887 Table[u[n], {n, 0, 20}]
%Y A374887 Cf. A000290, A000079, A374848.
%K A374887 nonn
%O A374887 0,2
%A A374887 _Clark Kimberling_, Sep 13 2024