OFFSET
1,2
COMMENTS
LINKS
W. Lang, On generalizations of Stirling number triangles, J. Integer Seqs., Vol. 3 (2000), #00.2.4.
W. Lang, First 10 rows.
FORMULA
a(n, m) = 6*(6*(n-1)+m)*a(n-1, m)/n + m*a(n-1, m-1)/n, n >= m >= 1; a(n, m) := 0, n<m; a(n, 0) := 0; a(1, 1)=1. G.f. for m-th column: ((-1+(1-36*x)^(-1/6))/6)^m.
EXAMPLE
{1}; {21,1}; {546,42,1}; {15561,1533,63,1}; ...
CROSSREFS
KEYWORD
AUTHOR
Wolfdieter Lang, Mar 19 2004
STATUS
approved