OFFSET
21,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 21..5000
FORMULA
a(n) ~ exp(sqrt(2*(Pi^2 - 6*polylog(2,-5))*n/3)) * sqrt(Pi^2 - 6*polylog(2,-5)) / (4*6!*sqrt(18)*Pi*n). - Vaclav Kotesovec, Sep 18 2019
MAPLE
b:= proc(n, i, k) option remember; `if`(n=0, 1, `if`(i<1, 0, add(
(t-> b(t, min(t, i-1), k))(n-i*j), j=1..n/i)*k+b(n, i-1, k)))
end:
a:= n-> (k-> add(b(n$2, k-i)*(-1)^i*binomial(k, i), i=0..k)/k!)(6):
seq(a(n), n=21..59);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 28 2019
STATUS
approved