OFFSET
1,1
COMMENTS
Row 4 of A219773
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/10080)*n^8 + (1/1680)*n^7 - (1/48)*n^6 + (41/120)*n^5 - (571/480)*n^4 - (593/240)*n^3 + (19457/252)*n^2 - (43041/70)*n + 1735 for n>9
EXAMPLE
Some solutions for n=3
..0..0..0....0..0..0....0..0..1....0..0..1....0..0..1....0..0..0....0..0..1
..0..0..0....0..0..1....0..0..0....0..0..1....0..0..1....0..0..0....0..0..0
..0..0..1....0..0..1....0..0..0....0..0..1....1..1..1....1..0..1....0..0..0
..0..0..1....1..0..0....0..0..1....0..0..1....1..1..1....1..1..1....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 27 2012
STATUS
approved