OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) - a(n-2) + a(n-3) - a(n-4) + a(n-7) - a(n-8) for n>16.
Empirical g.f.: x*(64 + 2657*x - 4872*x^2 + 2350*x^3 - 2775*x^4 + 2258*x^5 - 114*x^6 - 196*x^7 - 2915*x^8 + 1992*x^9 - 209*x^10 - 31*x^11 - 20*x^12 - 9*x^13 - 14*x^14 - 32*x^15) / ((1 - x)*(1 - x - x^3 - x^7)). - Colin Barker, Feb 20 2019
EXAMPLE
Some solutions for n=4:
..0..1..0..0. .0..0..0..1. .0..1..1..0. .0..1..0..0. .0..0..1..0
..0..1..0..1. .1..0..1..1. .0..1..0..0. .0..1..0..1. .1..1..0..1
..0..1..0..1. .1..0..1..0. .0..1..0..1. .0..1..0..1. .0..1..0..1
..0..1..0..1. .1..0..1..0. .0..1..0..1. .0..1..0..1. .0..1..0..1
..0..1..0..1. .0..0..1..0. .1..0..1..0. .0..1..0..1. .1..0..1..0
..0..1..0..1. .0..1..1..0. .1..0..1..0. .1..1..0..1. .1..0..1..0
..1..1..0..0. .0..1..0..0. .1..0..1..1. .0..0..1..0. .0..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 22 2017
STATUS
approved