OFFSET
0,2
COMMENTS
FORMULA
Column k has g.f. (1+x)^2*(k+1)x^k.
EXAMPLE
Triangle begins
1;
2, 2;
1, 4, 3;
0, 2, 6, 4;
0, 0, 3, 8, 5;
0, 0, 0, 4, 10, 6;
0, 0, 0, 0, 5, 12, 7;
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Oct 14 2005
STATUS
approved