OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..700
FORMULA
a(n) = 3^n/n! * Product_{k=0..n-1} (9*k - 1) for n > 0.
a(n) ~ 27^n / (Gamma(-1/9) * n^(10/9)). - Vaclav Kotesovec, Jun 16 2018
D-finite with recurrence: n*a(n) +3*(-9*n+10)*a(n-1)=0. - R. J. Mathar, Jan 16 2020
PROG
(PARI) N=20; x='x+O('x^N); Vec((1-27*x)^(1/9))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jun 16 2018
STATUS
approved