OFFSET
1,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..100
Eric Weisstein's World of Mathematics, Factorial
MATHEMATICA
Table[(n!)^2-1, {n, 30}] (* Vladimir Joseph Stephan Orlovsky, May 19 2011 *)
PROG
(PARI) a(n)=n!^2-1 \\ Charles R Greathouse IV, Sep 19 2012
(Magma) [Factorial(n)^2-1: n in [1..15]]; // Vincenzo Librandi, Jun 03 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved