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 A374863 #7 Aug 28 2024 09:37:55
%S A374863 0,2,45,840,23040,823680,29729700,1319205888,60949324800,
%T A374863 3307060721664,207247208103936,13289727219664896,959973192342388224,
%U A374863 77222763982780416000,6318019834620558704640,568402264910884213555200,52282854778694683852800000
%N A374863 Obverse convolution A000201**A001950; see Comments.
%C A374863 See A374848 for the definition of obverse convolution and a guide to related sequences.
%C A374863 A000201 and A001950 are assumed to start with a(0) = 0.
%t A374863 r = GoldenRatio;
%t A374863 s[n_] := Floor[n*r]; t[n_] := Floor[n*r^2];
%t A374863 u[n_] := Product[s[k] + t[n - k], {k, 0, n}]
%t A374863 Table[u[n], {n, 0, 20}]
%Y A374863 Cf. A000201, A001950, A001622, A374848.
%K A374863 nonn
%O A374863 0,2
%A A374863 _Clark Kimberling_, Aug 18 2024