OFFSET
0,7
FORMULA
a(n) ~ exp(2*Pi*(n-3)/3^(3/2) - 2*n - 3) * n^(3*n) / 6^n.
MATHEMATICA
Table[Product[Binomial[k-1, 3] + Binomial[n-k, 3], {k, 1, n}], {n, 0, 20}]
PROG
(PARI) a(n) = prod(k=1, n, binomial(k-1, 3) + binomial(n-k, 3)); \\ Michel Marcus, Jan 17 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Jan 16 2019
STATUS
approved