OFFSET
0,4
FORMULA
a(n) = A262033(n)^2.
Sum_{n>=0} 1/a(n) = 29/16 + (3/16)*Pi*StruveL(-1, 1/2) + (57/64)*Pi*StruveL(0, 1/2) + (1/4)*Pi*StruveL(1, 1/2), where StruveL is the modified Struve function. - Amiram Eldar, Dec 04 2022
MATHEMATICA
a[n_] := (n!/Floor[1 + n/2]!)^2; Array[a, 20, 0] (* Amiram Eldar, Dec 04 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Luschny, Dec 04 2019
STATUS
approved