OFFSET
2,1
FORMULA
E.g.f.: (1+x)*exp(-x-x^2/2*y/(1-y))*Sum((1-y)^(-binomial(n, 2))*x^n/n!, n=0..infinity).
EXAMPLE
3,12; 7,44,80,0; 12,111,440,840,630,0; 18,234,1532,6048,13692,13440,0,0; 25,441,4270,26740,106792,248696,277200,75600,0,0;
33,768,10360,92940,557322,2169416,5158512,6617520,3326400,0,0,0; ...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Goran Kilibarda, Vladeta Jovovic, May 21 2004
STATUS
approved