OFFSET
0,3
COMMENTS
FORMULA
Number triangle T(n, k)=binomial(k, n-k)2^k*(3/2)^(n-k) Columns have g.f. (2x+3x^2)^k.
EXAMPLE
Rows begin
1;
0,2;
0,3,4;
0,0,12,8;
0,0,9,36,16;
CROSSREFS
KEYWORD
AUTHOR
Paul Barry, Sep 25 2004
STATUS
approved