OFFSET
2,1
LINKS
Matthew House, Table of n, a(n) for n = 2..251
FORMULA
a(n) = n*(n-1)*(n!)^2/2. - Matthew House, Feb 15 2017
MATHEMATICA
a = {}; Do[k = CoefficientList[Expand[(y + n!)^n], y]; AppendTo[a, k[[Length[k] - 2]]], {n, 1, 50}]; a
Table[n(n-1) (n!)^2/2, {n, 2, 20}] (* Harvey P. Dale, Sep 03 2022 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Oct 22 2007
STATUS
approved