OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..100
MAPLE
4^n*(2*n+1)!*(n!)^2/(n+1);
MATHEMATICA
Table[(4^n (2n+1)! (n!)^2)/(n+1), {n, 0, 10}] (* Harvey P. Dale, Nov 04 2017 *)
PROG
(PARI) a(n) = {4^n*(2*n+1)!*(n!)^2/(n+1)} \\ Andrew Howroyd, Jan 01 2020
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Joe Keane (jgk(AT)jgk.org)
EXTENSIONS
Terms a(10) and beyond from Andrew Howroyd, Jan 01 2020
STATUS
approved