OFFSET
1,1
COMMENTS
Column 1 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*(65536 - 130364*x + 65537*x^2 + 1468*x^3 - 63033*x^4 + 131224*x^5 - 67041*x^6 - 2466*x^7 - 67848*x^8 + 63218*x^9 + 1305*x^10 + 1631*x^11 + 569*x^12 + 547*x^13 + 256*x^14) / ((1 - x)*(1 - x - x^4 + x^5 - x^8)). - Colin Barker, Feb 07 2018
EXAMPLE
Some solutions for 5 X 4:
..0..0..0..0....0..1..0..0....0..0..0..0....0..0..0..0....1..0..1..1
..0..0..1..0....0..1..0..0....0..0..0..0....0..0..0..0....1..1..0..0
..0..0..0..0....0..1..0..0....1..0..0..0....0..0..0..0....0..1..1..0
..0..0..0..0....0..1..0..0....0..0..0..0....1..0..0..0....0..0..1..1
..1..0..1..1....0..1..0..0....1..0..0..0....0..0..0..0....1..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 20 2011
STATUS
approved