OFFSET
0,4
FORMULA
a(n) ~ (n-1)! * (-1)^(n+1) * cosh(1). - Vaclav Kotesovec, Jan 23 2015
a(n) = -(-1)^n * Sum_{k=0..floor((n-1)/2)} binomial(n,2*k) * (n-2*k-1)!. - Ilya Gutkovskiy, Apr 10 2022
MATHEMATICA
CoefficientList[Series[Cosh[x]*Log[1 + x], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved