OFFSET
0,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..100
FORMULA
a(n) = floor((3*n)!*C) where C = 1/3*exp(1)+2/3*exp(-1/2)*cos(1/2*3^(1/2)) = 1.16805831337591852551625692...
PROG
(PARI) a(n)={sum(k=0, n, (3*n)!/(3*k)!)} \\ Andrew Howroyd, Jan 27 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladeta Jovovic, Oct 20 2003
EXTENSIONS
Terms a(11) and beyond from Andrew Howroyd, Jan 27 2020
STATUS
approved