OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..253
Eric Weisstein's World of Mathematics, Factorial Sums
FORMULA
a(n) = A061062(n) - 1. - Michel Marcus, Feb 28 2014
MATHEMATICA
Table[Sum[(k!)^2, {k, n}], {n, 15}] (* Harvey P. Dale, Jul 21 2011 *)
Accumulate[(Range[20]!)^2] (* Much more efficient than the above program. *) (* Harvey P. Dale, Aug 15 2022 *)
PROG
(PARI) a(n) = sum(k=1, n, k!^2); \\ Michel Marcus, Jul 16 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Eric W. Weisstein, Mar 02 2005
EXTENSIONS
More terms from Vladimir Joseph Stephan Orlovsky, Sep 24 2009
STATUS
approved