OFFSET
1,1
COMMENTS
Column 7 of A223644
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..78
FORMULA
Empirical: a(n) = (503/209563200)*n^14 - (185069/778377600)*n^13 + (1733819/119750400)*n^12 - (7176551/11975040)*n^11 + (36644381/2177280)*n^10 - (480531353/1814400)*n^9 - (76780811581/76204800)*n^8 + (29262582467/155520)*n^7 - (62420351374933/10886400)*n^6 + (281872655928541/2721600)*n^5 - (74234681724454753/59875200)*n^4 + (3261809312979967/332640)*n^3 - (557318597695013723/11642400)*n^2 + (14542780178794541/120120)*n - 90173668357 for n>19
EXAMPLE
Some solutions for n=4
..0..0..0..1..1..0..0....0..1..1..0..0..0..0....0..0..1..0..0..0..0
..0..0..1..1..1..1..1....0..1..1..1..1..1..0....0..1..1..1..1..1..1
..0..1..1..1..1..1..0....0..0..0..1..1..1..0....1..1..1..1..1..1..0
..0..0..0..0..1..0..0....0..0..0..0..0..0..1....0..0..0..0..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 24 2013
STATUS
approved