OFFSET
1,2
COMMENTS
Column 3 of A296990.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 3*a(n-1) +2*a(n-2) +19*a(n-3) -19*a(n-4) -52*a(n-5) -67*a(n-6) +15*a(n-7) +155*a(n-8) +207*a(n-9) -104*a(n-10) -157*a(n-11) -172*a(n-12) +53*a(n-13) +63*a(n-14) +38*a(n-15) +14*a(n-16) +19*a(n-17) +3*a(n-18) +4*a(n-19) +2*a(n-20)
EXAMPLE
Some solutions for n=7
..0..1..1. .1..1..0. .0..0..0. .0..1..0. .0..0..0. .0..0..0. .0..1..0
..0..1..1. .1..1..1. .0..1..1. .1..1..1. .0..0..0. .0..0..0. .1..1..1
..1..1..0. .0..0..1. .1..1..1. .0..1..1. .1..1..0. .1..1..0. .0..1..0
..1..0..0. .0..1..1. .0..1..0. .0..0..0. .1..1..0. .1..1..0. .0..1..0
..1..1..0. .0..1..1. .0..1..1. .0..1..1. .0..0..0. .0..0..0. .0..1..1
..1..1..0. .0..1..1. .1..1..0. .0..1..1. .0..1..1. .1..1..0. .1..1..0
..1..1..0. .0..1..1. .1..1..0. .0..1..1. .0..1..1. .1..1..0. .1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 22 2017
STATUS
approved