OFFSET
1,4
COMMENTS
Column 1 of A264560.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..48
FORMULA
a(n) = Product_{i=0..2} ceiling((n-i)/3)!. - Alois P. Heinz, Jul 09 2016
a(n) ~ 2 * Pi * (n+1)! / 3^(n + 3/2). - Vaclav Kotesovec, Oct 02 2018
EXAMPLE
All solutions for n=4
..0....3
..3....0
..1....1
..2....2
MATHEMATICA
Table[Product[Floor[(n + i)/3]!, {i, 0, 2}], {n, 1, 30}] (* Vaclav Kotesovec, Oct 02 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2015
STATUS
approved