OFFSET
0,2
COMMENTS
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..100
MATHEMATICA
Table[((2 n)! - n! + 1), {n, 0, 30}] (* Vincenzo Librandi, Feb 11 2014 *)
PROG
(PARI) A237580 = n->(2*n)!-n!+1
(Magma) [Factorial(2*n)-Factorial(n)+1: n in [0..15]]; // Vincenzo Librandi, Feb 11 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Feb 09 2014
STATUS
approved