OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 14*a(n-1) - 40*a(n-2) - 12*a(n-3) + 107*a(n-4) - 12*a(n-5) - 60*a(n-6) + 16*a(n-7) for n>8.
Empirical g.f.: x*(13 - 48*x - 46*x^2 + 243*x^3 - 24*x^4 - 291*x^5 + 40*x^6 + 16*x^7) / ((1 + x)*(1 - 2*x)*(1 - 13*x + 29*x^2 + 15*x^3 - 34*x^4 + 8*x^5)). - Colin Barker, Feb 27 2019
EXAMPLE
Some solutions for n=5:
..0..0..1..0..1. .0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..0
..0..0..0..0..0. .0..1..0..1..0. .1..0..0..1..0. .1..0..1..0..0
..0..0..1..0..1. .0..0..0..1..0. .0..0..0..1..1. .1..0..1..0..1
..1..0..0..0..0. .1..0..0..0..1. .0..0..1..1..0. .0..0..1..0..0
..0..1..0..0..0. .0..0..0..0..1. .1..0..0..0..1. .0..0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 28 2017
STATUS
approved