OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) + 17*a(n-2) - 20*a(n-3) - 85*a(n-4) + 68*a(n-5) + 146*a(n-6) - 84*a(n-7) - 56*a(n-8) + 24*a(n-9).
Empirical g.f.: x*(49 + 93*x - 457*x^2 - 694*x^3 + 1424*x^4 + 1456*x^5 - 1592*x^6 - 692*x^7 + 384*x^8) / (1 - 2*x - 17*x^2 + 20*x^3 + 85*x^4 - 68*x^5 - 146*x^6 + 84*x^7 + 56*x^8 - 24*x^9). - Colin Barker, Nov 27 2018
EXAMPLE
Some solutions for n=4:
..1..1..1..1....1..1..1..1....1..0..1..1....0..1..0..1....0..0..1..0
..1..0..1..0....0..1..1..0....1..1..1..1....0..0..0..0....1..0..0..0
..1..1..1..1....1..1..0..0....1..1..0..1....1..0..1..0....1..1..0..1
..1..0..1..0....0..1..1..0....0..1..1..1....1..1..1..1....1..1..1..1
..1..1..1..1....1..1..1..1....1..1..1..1....0..1..1..1....1..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 30 2014
STATUS
approved