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 A134374 #16 Nov 20 2024 16:13:53
%S A134374 1,36,14400,25401600,131681894400,1593350922240000,
%T A134374 38775788043632640000,1710012252724199424000000,
%U A134374 126513546505547170185216000000,14797530453474819213543604224000000
%N A134374 a(n) = ((2n+1)!)^2.
%F A134374 a(n) = A009445(n)^2 = A001044(2n+1). - _Wesley Ivan Hurt_, May 02 2014
%F A134374 From _Amiram Eldar_, Nov 16 2020: (Start)
%F A134374 Sum_{n>=0} 1/a(n) = A334378.
%F A134374 Sum_{n>=0} (-1)^n/a(n) = Im(BesselJ(0, 2*exp(3*Pi*i/4))). (End)
%p A134374 A134374:=n->((2*n+1)!)^2; seq(A134374(n), n=0..10); # _Wesley Ivan Hurt_, May 02 2014
%t A134374 Table[((2n+1)!)^(2), {n, 0, 10}]
%o A134374 (PARI) a(n) = ((2*n+1)!)^2; \\ _Michel Marcus_, Nov 16 2020
%Y A134374 Cf. A000142, A001044, A000442, A036740, A010050, A009445, A134366, A134367, A134368, A134369, A134371, A134372, A134373, A134375, A334378.
%K A134374 nonn,easy
%O A134374 0,2
%A A134374 _Artur Jasinski_, Oct 22 2007