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 A208147 #17 Dec 12 2024 15:38:56
%S A208147 1,2,6,12,48,96,288,576,2880,5760,17280,34560,138240,276480,829440,
%T A208147 1658880,9953280,19906560,59719680,119439360,477757440,955514880,
%U A208147 2866544640,5733089280,28665446400,57330892800,171992678400,343985356800,1375941427200,2751882854400
%N A208147 Sequence generated from A089080.
%H A208147 Alois P. Heinz, <a href="/A208147/b208147.txt">Table of n, a(n) for n = 1..2268</a>
%F A208147 a(1) = 1; for n>1, a(n) = A089080(n) * a(n-1).
%F A208147 a(n) = (2*n-1)!/A067281(2*n-1). - _Alois P. Heinz_, Dec 11 2023
%F A208147 a(n) = Product_{k=1..2*n-2} A001511(k). - _Ridouane Oudra_, Nov 24 2024
%e A208147 a(5) = 48 = A089080(5) * a(4) = 4 * 12.
%p A208147 seq(mul(padic[ordp](2*k,2), k=1..2*n-2), n=1..40); # _Ridouane Oudra_, Nov 24 2024
%Y A208147 Cf. A000142, A067281, A089080, A001511.
%K A208147 nonn,easy
%O A208147 1,2
%A A208147 _Gary W. Adamson_, Feb 23 2012