OFFSET
1,1
COMMENTS
Row 4 of A219519
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/40320)*n^8 - (1/3360)*n^7 + (7/576)*n^6 - (7/60)*n^5 + (1567/5760)*n^4 + (2201/160)*n^3 - (116111/672)*n^2 + (251961/280)*n - 1757 for n>9
EXAMPLE
Some solutions for n=3
..0..0..1....0..0..0....0..0..1....0..0..1....0..0..1....0..0..0....0..0..1
..0..0..1....0..0..0....0..0..0....0..0..1....1..0..1....0..0..0....0..0..1
..0..0..1....0..0..1....0..0..0....0..0..0....1..1..1....0..0..0....1..0..1
..1..0..1....1..0..0....0..1..0....0..0..0....1..1..1....1..1..1....1..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 21 2012
STATUS
approved