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 A374893 #5 Sep 15 2024 10:55:47
%S A374893 1,4,54,2240,294000,127534176,189691951680,994556567347200,
%T A374893 18760374808177860000,1292781708803753625600000,
%U A374893 329281303607781567523264143360,312866979311142515971112580848148480,1117139877664193310898467728367016525532160
%N A374893 Obverse convolution (n)**A000984; see Comments.
%C A374893 See A374848 for the definition of obverse convolution and a guide to related sequences.
%t A374893 s[n_] := n; t[n_] := Binomial[2 n, n];
%t A374893 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374893 Table[u[n], {n, 0, 14}]
%Y A374893 Cf. A000027, A000893, A374848.
%K A374893 nonn
%O A374893 0,2
%A A374893 _Clark Kimberling_, Sep 14 2024