OFFSET
1,1
COMMENTS
Column 7 of A253510
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/6)*n^5 + (11/6)*n^4 + (97/6)*n^3 + (3661/6)*n^2 - (1501/3)*n - 980 for n>12
EXAMPLE
Some solutions for n=4
..1..1..1..1..1..1..1..1..0....0..1..1..1..1..1..1..1..1
..1..1..1..1..1..1..1..1..0....1..1..1..1..1..1..1..1..0
..1..1..1..1..1..1..0..0..0....1..1..1..1..1..1..1..1..0
..1..1..1..1..1..1..1..1..1....1..1..1..1..1..1..1..0..0
..1..1..1..1..0..0..0..0..0....1..1..1..1..1..0..1..0..1
..1..1..1..0..0..1..1..1..1....0..0..0..0..0..0..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 02 2015
STATUS
approved