OFFSET

1,1

COMMENTS

Column 2 of A281955.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 4*a(n-1) -2*a(n-2) +4*a(n-3)

EXAMPLE

Some solutions for n=4

..0..1. .0..0. .0..1. .0..0. .0..0. .0..1. .0..1. .0..0. .0..1. .0..0

..0..1. .0..0. .1..1. .1..0. .1..0. .0..1. .1..1. .0..1. .0..0. .0..1

..0..1. .0..0. .0..1. .1..1. .1..1. .1..1. .0..1. .0..1. .0..0. .1..0

..1..1. .1..1. .1..0. .1..1. .0..0. .0..0. .0..1. .0..0. .1..0. .0..1

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 03 2017

STATUS

approved