OFFSET
1,3
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) - 7*a(n-2) - 31*a(n-4) + 14*a(n-5) + 51*a(n-6) + 52*a(n-7) + 12*a(n-8) - 96*a(n-9) - 64*a(n-10).
Empirical g.f.: 2*x^3*(1 - 2*x)*(1 + 2*x)*(5 - 4*x^2) / ((1 + x + 2*x^2)^2*(1 - 4*x + x^2 + 4*x^3)^2). - Colin Barker, Feb 21 2019
EXAMPLE
Some solutions for n=4:
..0..1..1..1. .1..1..0..1. .0..1..0..0. .0..1..1..0. .1..1..1..1
..0..0..0..1. .0..1..1..1. .1..1..1..1. .0..1..0..1. .0..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 15 2017
STATUS
approved