OFFSET
6,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 6..461
FORMULA
a(n) ~ c * 3^(3*n/2) * n^(n + 9/2) / (exp(n) * 2^n * Pi^n), where c = 0.000357063672536829943422824320618... . - Vaclav Kotesovec, Dec 22 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Dec 09 2016
STATUS
approved