OFFSET
0,3
LINKS
FORMULA
E.g.f.: 1/(1 - x) - x*(1 + x)*exp(x). - Ilya Gutkovskiy, Jan 27 2017
MATHEMATICA
Table[n! - n^2, {n, 0, 30}] (* Vladimir Joseph Stephan Orlovsky, Jun 27 2011 *)
PROG
(Magma) [Factorial(n) - n^2: n in [0..25]]; // Vincenzo Librandi, Jun 28 2011
(PARI) a(n)=n!-n^2 \\ Charles R Greathouse IV, Jun 28 2011
CROSSREFS
KEYWORD
sign,easy
AUTHOR
STATUS
approved