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 A374657 #4 Jul 31 2024 11:28:26
%S A374657 1,3,15,90,810,10530,210600,6528600,319901400,24952309200,
%T A374657 3119038650000,626926768650000,203124273042600000,
%U A374657 106233994801279800000,89767725607081431000000,122622713179273234746000000,270873573413014575553914000000
%N A374657 a(n) = (1/4) A374656(n).
%C A374657 a(n+1)/a(n) is an integer for n>=0, so (a(n)) is a divisibility sequence.
%t A374657 w[n_] := Product[LucasL[k] + 2, {k, 0, n}]
%t A374657 (1/4) Table[w[n], {n, 0, 20}]
%Y A374657 Cf. A000032, A374654, A374656.
%K A374657 nonn
%O A374657 0,2
%A A374657 _Clark Kimberling_, Jul 28 2024