OFFSET
1,1
COMMENTS
Column 2 of A186619.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..142
FORMULA
Empirical: a(n) = a(n-1)+a(n-4)-a(n-5)+a(n-6)-a(n-7)-a(n-10)+a(n-11)+a(n-12)-a(n-16) for n>25.
EXAMPLE
Some solutions for 9 X 7
..0..0..0..0..1..0..0....0..0..0..0..0..1..0....1..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..0..0..1..0..0..1....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..1..1..1..0..0..0..0....0..0..0..0..0..0..0....0..1..0..1..0..0..0
..0..1..1..1..0..0..0....1..1..1..0..1..0..0....0..0..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 24 2011
STATUS
approved