OFFSET
1,3
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..200
FORMULA
a(n) = A024176(n)/2.
a(n) ~ sqrt(Pi/2) * (log(2) - 1/2) * n^(n + 5/2) / exp(n). - Vaclav Kotesovec, Jan 02 2020
MATHEMATICA
Table[(n+2)!/2 * Sum[(-1)^(k+1)/k, {k, 3, n+2}], {n, 1, 25}] (* Vaclav Kotesovec, Jan 02 2020 *)
PROG
(PARI) a(n) = (n+2)!*sum(x=1, n, (-1)^(x+1)/(x+2))/2 \\Michel Marcus, Mar 21 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Terms a(16) and beyond from Andrew Howroyd, Jan 01 2020
STATUS
approved