OFFSET
1,2
COMMENTS
Column 3 of A297915.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) +a(n-2) -17*a(n-4) -2*a(n-6) +3*a(n-7) +53*a(n-8) -11*a(n-9) -60*a(n-10) +14*a(n-11) +20*a(n-12) -4*a(n-13) for n>15
EXAMPLE
Some solutions for n=7
..0..0..0. .0..1..0. .0..1..0. .0..0..0. .0..0..1. .0..1..1. .0..0..1
..0..1..0. .1..1..1. .1..1..1. .0..1..0. .0..1..1. .0..0..1. .1..0..0
..0..1..1. .1..0..0. .0..0..0. .1..1..0. .0..0..1. .0..1..1. .1..1..1
..0..0..1. .0..1..0. .0..1..0. .1..0..1. .1..0..0. .1..0..1. .0..0..1
..0..1..1. .0..1..1. .0..1..1. .0..1..0. .1..1..0. .1..0..0. .0..1..1
..0..1..1. .0..1..1. .1..0..0. .1..0..1. .0..0..0. .1..0..0. .0..0..0
..0..0..1. .0..0..1. .1..1..0. .1..1..1. .1..0..1. .1..1..0. .1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2018
STATUS
approved