OFFSET
1,2
COMMENTS
Column 3 of A281400.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) -4*a(n-2) +6*a(n-3) -18*a(n-4) +4*a(n-5) +15*a(n-6) -6*a(n-7) +31*a(n-8) -48*a(n-9) +32*a(n-10) +8*a(n-11) -48*a(n-12) +32*a(n-13) -16*a(n-14) for n>19
EXAMPLE
Some solutions for n=4
..0..0..0. .0..0..1. .0..1..1. .0..1..0. .0..0..0. .0..0..1. .0..0..1
..1..1..1. .1..0..0. .0..1..1. .1..1..0. .0..1..0. .1..0..1. .1..0..1
..0..0..1. .1..1..0. .0..0..1. .0..0..1. .1..0..1. .1..0..1. .0..1..1
..0..1..1. .0..1..0. .1..0..1. .1..1..1. .1..0..1. .0..1..1. .0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 21 2017
STATUS
approved