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 A374869 #5 Sep 11 2024 13:36:10
%S A374869 2,12,150,3528,151470,11835252,1695534750,450137811600,
%T A374869 223862873592150,210586842089730540,377818996488206253750,
%U A374869 1301732219036581449975000,8661531388920997249932018750,111817906864517248017080187253860,2811403559627160557559224217577548750
%N A374869 Obverse convolution (2n+1)**(2^n); see Comments.
%C A374869 See A374848 for the definition of obverse convolution and a guide to related sequences.
%t A374869 s[n_] := 2 n + 1; t[n_] := 2^n;
%t A374869 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374869 Table[u[n], {n, 0, 20}]
%Y A374869 Cf. A005408, A000079, A374848.
%K A374869 nonn
%O A374869 0,1
%A A374869 _Clark Kimberling_, Aug 28 2024