OFFSET
1,1
FORMULA
a(n) ~ 3^(3*n-1/2) / (2*Pi*n^2). - Vaclav Kotesovec, Feb 19 2015
D-finite with recurrence: n^2*a(n) -3*(3*n-2)*(3*n-4)*a(n-1)=0. - R. J. Mathar, Apr 27 2020
MATHEMATICA
Table[Multinomial[n, n, n]/(3*n-1), {n, 1, 20}] (* Vaclav Kotesovec, Feb 19 2015 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
More terms from James A. Sellers, Aug 08 2000
STATUS
approved