OFFSET
1,1
COMMENTS
Column 5 of A188105.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 2*a(n-1) - a(n-2) + a(n-4) - 2*a(n-5) + a(n-6) + a(n-8) - a(n-9) for n>15.
Empirical g.f.: x*(8274 - 15066*x + 8323*x^2 + 493*x^3 - 7674*x^4 + 13290*x^5 - 8807*x^6 - 465*x^7 - 8706*x^8 + 8988*x^9 + 253*x^10 - 988*x^11 + 224*x^12 + 1681*x^14) / ((1 - x)*(1 - x - x^4 + x^5 - x^8)). - Colin Barker, Feb 15 2018
EXAMPLE
Some solutions for 5 X 8:
..0..0..0..0..0..1..0..0....1..1..0..0..1..1..0..0....0..0..0..0..0..0..1..0
..0..0..0..0..0..0..0..0....0..1..1..0..0..1..1..0....0..0..0..0..0..0..0..1
..0..0..0..0..0..0..0..0....0..0..1..1..0..0..1..1....1..0..0..0..0..0..0..0
..1..0..0..0..0..0..0..0....1..0..0..1..1..0..0..1....1..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..0....1..1..0..0..1..1..0..0....0..1..0..0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 20 2011
STATUS
approved