OFFSET
0,3
COMMENTS
EXAMPLE
In the table of successive self-convolutions:
1,1,2,12,136,2295,51827,1475418,...
1,2,5,28,300,4910,108932,3066934,...
1,3,9,49,498,7893,171875,4783641,...
1,4,14,76,737,11300,241288,6635496,...
1,5,20,110,1025,15196,317885,8633420,...
1,6,27,152,1371,19656,402473,10789410,...
1,7,35,203,1785,24766,495964,13116664,...
the main diagonal is equal to A108992: 1,2,9,76,1025,19656,495964,15629720,...
PROG
(PARI) {a(n)=local(F=1+x*O(x^n), G=0); for(m=0, n, for(k=1, m+1, F=(1+x*F)^k); G=G+polcoeff(F, m)/(m+1)*x^m); F=x/serreverse(x*Ser(G)); polcoeff(F, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 15 2005
STATUS
approved