OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..450
MAPLE
b:= proc(n, k) option remember;
`if`(k=0, n!, b(n, k-1)-b(n-1, k-1))
end:
a:= n-> add(b(n-k, k), k=0..n/2):
seq(a(n), n=0..23);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 01 2021
STATUS
approved