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 A374860 #8 Aug 28 2024 10:56:43
%S A374860 1,2,8,40,280,2520,25200,302400,3931200,58968000,1002456000,
%T A374860 18044208000,360884160000,7939451520000,182607384960000,
%U A374860 4565184624000000,118694800224000000,3323454406272000000,99703632188160000000,3090812597832960000000,101996815728487680000000
%N A374860 Obverse convolution (1)**A000201; see Comments.
%C A374860 See A374848 for the definition of obverse convolution and a guide to related sequences. a(n+1)/a(n) is an integer for n>=0, so (a(n)) is a divisibility sequence.
%C A374860 A000201 is assumed to start with a(0) = 0.
%F A374860 a(n) = Product_{k=0..n} A026351(k).
%t A374860 r = GoldenRatio;
%t A374860 s[n_] := 1; t[n_] := Floor[n*r];
%t A374860 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374860 Table[u[n], {n, 0, 20}]
%Y A374860 Cf. A000012, A000201, A001622, A374848, A026351.
%K A374860 nonn
%O A374860 0,2
%A A374860 _Clark Kimberling_, Aug 18 2024