OFFSET
1,2
COMMENTS
Column 3 of A280180.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) -24*a(n-2) -9*a(n-3) +147*a(n-4) -213*a(n-5) -80*a(n-6) +567*a(n-7) -624*a(n-8) -30*a(n-9) +711*a(n-10) -687*a(n-11) +215*a(n-12) +84*a(n-13) +3*a(n-14) -86*a(n-15) +27*a(n-16) +6*a(n-17) -17*a(n-18) -18*a(n-19) -6*a(n-20) -a(n-21) for n>28
EXAMPLE
Some solutions for n=4
..0..0..0. .0..1..1. .0..1..1. .0..0..0. .0..1..1. .0..1..1. .0..1..0
..0..1..0. .1..1..0. .0..1..1. .1..1..0. .1..1..1. .0..1..0. .0..0..0
..1..0..0. .1..1..1. .0..1..0. .1..1..1. .1..0..1. .1..0..0. .0..0..0
..1..1..1. .1..1..1. .1..1..0. .0..1..1. .1..1..1. .0..0..0. .1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 28 2016
STATUS
approved