OFFSET
28,1
LINKS
Alois P. Heinz, Table of n, a(n) for n = 28..160
FORMULA
a(n) ~ c * (3*sqrt(3)/(2*Pi))^n * n! * n^9, where c = 0.0000000002026268159682390665... = c0 * (c0-1)^9 / (3^9 * 9!), and c0 = (1 + exp(Pi/sqrt(3))) * sqrt(3) / (2*Pi). - Vaclav Kotesovec, Aug 26 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Aug 20 2014
STATUS
approved