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 A374861 #4 Aug 28 2024 10:56:58
%S A374861 0,1,12,144,2400,50400,1143072,31046400,903260160,30356726400,
%T A374861 1154305152000,46189964620800,2053748448460800,100323076215398400,
%U A374861 5103635783178240000,282151131740577792000,16183501766885376000000,999942682759884864000000
%N A374861 Obverse convolution (n)**A000201; see Comments.
%C A374861 See A374848 for the definition of obverse convolution and a guide to related sequences.
%t A374861 r = GoldenRatio;
%t A374861 s[n_] := n; t[n_] := Floor[n*r];
%t A374861 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374861 Table[u[n], {n, 0, 22}]
%Y A374861 Cf. A000027, A000201, A001622, A374848.
%K A374861 nonn
%O A374861 0,3
%A A374861 _Clark Kimberling_, Aug 18 2024