OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..54
FORMULA
MAPLE
a:= n-> add(`if`(j=n, 1, (j*(n-j))!/((n-j)!^j*j!)), j=0..n):
seq(a(n), n=0..15);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Feb 17 2024
STATUS
approved