OFFSET
0,2
FORMULA
From Amiram Eldar, Nov 16 2020: (Start)
Sum_{n>=0} 1/a(n) = A334378.
Sum_{n>=0} (-1)^n/a(n) = Im(BesselJ(0, 2*exp(3*Pi*i/4))). (End)
MAPLE
MATHEMATICA
Table[((2n+1)!)^(2), {n, 0, 10}]
PROG
(PARI) a(n) = ((2*n+1)!)^2; \_ Michel Marcus, Nov 16 2020
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Artur Jasinski, Oct 22 2007
STATUS
approved