OFFSET
1,3
COMMENTS
Column 2 of A280810.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) -30*a(n-2) +48*a(n-3) -45*a(n-4) +18*a(n-5) +44*a(n-6) -60*a(n-7) +30*a(n-8) -2*a(n-9) -51*a(n-10) +21*a(n-11) +13*a(n-12) -3*a(n-13) +18*a(n-14) +7*a(n-15) -9*a(n-16) -6*a(n-17) -a(n-18)
EXAMPLE
Some solutions for n=4
..0..0. .0..1. .0..0. .0..0. .0..1. .0..1. .0..0. .0..1. .0..0. .0..1
..1..1. .1..1. .1..0. .0..1. .1..0. .1..1. .0..0. .0..0. .0..1. .0..0
..0..0. .0..0. .0..0. .0..1. .0..0. .0..1. .1..1. .1..1. .0..0. .0..1
..0..0. .0..0. .1..0. .1..1. .0..1. .1..1. .0..1. .1..1. .0..1. .0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 08 2017
STATUS
approved