OFFSET
0,3
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..30
FORMULA
MAPLE
a:= n-> binomial(n+1, 2)!/n!:
seq(a(n), n=0..12);
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 21 2014
STATUS
approved