OFFSET
1,1
COMMENTS
Column 3 of A227025
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/2217600)*n^11 + (1/48384)*n^10 + (19/241920)*n^9 + (199/2800)*n^7 - (4291/11520)*n^6 - (3567/1792)*n^5 + (1336261/24192)*n^4 - (95295341/302400)*n^3 + (851237/1440)*n^2 + (8658337/9240)*n - 3550 for n>6
EXAMPLE
Some solutions for n=4
..0..0..0....0..1..0....0..0..2....0..1..1....0..0..1....0..1..2....0..0..1
..0..0..0....0..0..0....0..0..2....1..1..1....0..1..1....0..2..2....1..2..1
..0..1..0....1..1..1....0..1..1....0..0..1....1..0..0....1..0..0....2..2..2
..1..0..0....2..2..0....1..1..1....1..1..0....0..0..0....1..0..0....2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 27 2013
STATUS
approved