OFFSET
1,2
EXAMPLE
The table starts:
1
2 5 2
3 8 14 8 3
4 11 20 30 20 11 4
PROG
(PARI) al(n)=Vec(sum(k=1, n, k*x^(k-1))*sum(k=1, n, k*x^(n-k)))
CROSSREFS
KEYWORD
nonn,tabf,easy
AUTHOR
Franklin T. Adams-Watters, Mar 02 2011
STATUS
approved