OFFSET
0,9
FORMULA
a(n) = n! * Sum_{k=0..floor(n/8)} (4*k)! * |Stirling1(n-4*k,4*k)|/(576^k * k! * (n-4*k)!).
PROG
(PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp((x*log(1-x))^4/576)))
(PARI) a(n) = n!*sum(k=0, n\8, (4*k)!*abs(stirling(n-4*k, 4*k, 1))/(576^k*k!*(n-4*k)!));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, May 09 2022
STATUS
approved