OFFSET
0,2
COMMENTS
Limit n->infinity (a(n)/n!)^(1/n) = 12.67567... . - Vaclav Kotesovec, Mar 19 2016
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 0..350
PROG
(PARI) {a(n)=local(A=1+(2*n+1)*x); for(j=0, n, A=1+(2*n+1-j)*x*A^2 +x*O(x^n)); polcoeff(A, n)}
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Mar 11 2007
STATUS
approved