OFFSET
1,4
COMMENTS
Column 1 of A279305.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) - 6*a(n-2) - 16*a(n-3) + 12*a(n-4) + 24*a(n-5) + 8*a(n-6) for n>8.
Empirical g.f.: x^2*(1 - 2*x - x^2)*(1 - 4*x + 2*x^2 + 4*x^3 + 4*x^4) / (1 - 2*x - 2*x^2)^3. - Colin Barker, Feb 21 2018
EXAMPLE
All solutions for n=4:
..0. .0. .0
..0. .1. .0
..1. .1. .0
..1. .1. .1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 09 2016
STATUS
approved