OFFSET
1,3
COMMENTS
Column 2 of A279925.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 24*a(n-1) -192*a(n-2) +500*a(n-3) +204*a(n-4) -996*a(n-5) +1248*a(n-6) -1056*a(n-7) -4176*a(n-8) +2528*a(n-9) +912*a(n-10) -1536*a(n-11) +8896*a(n-12) +5376*a(n-13) -3648*a(n-14) -192*a(n-15) -3840*a(n-16) -9216*a(n-17) -4096*a(n-18) for n>19
EXAMPLE
Some solutions for n=4
..0..0. .0..0. .0..0. .0..1. .0..1. .0..1. .0..1. .0..1. .0..0. .0..1
..1..0. .1..2. .1..0. .1..1. .1..0. .1..1. .0..2. .1..1. .1..0. .1..2
..0..2. .2..0. .0..0. .2..1. .1..1. .0..2. .2..1. .0..1. .2..0. .1..1
..0..0. .0..0. .2..1. .1..0. .1..0. .0..0. .1..1. .2..1. .2..2. .1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 23 2016
STATUS
approved