OFFSET
1,2
COMMENTS
Column 3 of A296115.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
Robert Israel, Maple-assisted proof of formula
FORMULA
Empirical: a(n) = a(n-1) +3*a(n-2) +15*a(n-3) +2*a(n-4) -18*a(n-5) -36*a(n-6) -21*a(n-7) -25*a(n-8) +3*a(n-9) +11*a(n-10) +6*a(n-11).
Empirical formula verified by Robert Israel, Dec 04 2017 (see link).
EXAMPLE
Some solutions for n=7
..0..0..0. .0..0..0. .0..0..0. .0..1..1. .0..0..0. .0..1..1. .0..1..1
..0..1..1. .0..1..1. .0..1..1. .0..1..1. .1..1..0. .0..1..1. .0..1..1
..0..1..1. .0..1..1. .0..1..1. .0..1..0. .1..1..0. .0..0..1. .1..0..0
..0..0..1. .0..0..0. .0..0..1. .0..1..1. .0..0..0. .0..1..1. .1..1..0
..0..1..0. .1..1..0. .0..1..0. .0..1..1. .0..1..0. .0..0..1. .0..1..0
..1..1..1. .1..1..0. .1..1..0. .0..0..0. .1..1..1. .1..1..0. .0..1..1
..0..1..0. .0..0..0. .1..1..0. .0..0..0. .0..1..0. .1..1..0. .0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 04 2017
STATUS
approved