A046032 a(n) = (n!)^2 - 1.

0, 3, 35, 575, 14399, 518399, 25401599, 1625702399, 131681894399, 13168189439999, 1593350922239999, 229442532802559999, 38775788043632639999, 7600054456551997439999, 1710012252724199423999999, 437763136697395052543999999, 126513546505547170185215999999

Offset: 1

Author

Eric W. Weisstein

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..100
• Eric Weisstein's World of Mathematics, Factorial

Crossrefs

Cf. A001044.

Programs

Magma

[Factorial(n)^2-1: n in [1..15]]; // Vincenzo Librandi, Jun 03 2013

Mathematica

Table[(n!)^2-1,{n,30}] (* Vladimir Joseph Stephan Orlovsky, May 19 2011 *)

PARI

a(n)=n!^2-1 \\ Charles R Greathouse IV, Sep 19 2012