OFFSET
1,1
COMMENTS
Column 4 of A268809.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +19*a(n-2) +10*a(n-3) -122*a(n-4) -320*a(n-5) -295*a(n-6) +8*a(n-7) +176*a(n-8) +20*a(n-9) -98*a(n-10) -6*a(n-11) +43*a(n-12) -6*a(n-13) -11*a(n-14) +6*a(n-15) -a(n-16) for n>19
EXAMPLE
Some solutions for n=4
..2..2..2..2. .2..2..2..1. .1..2..1..2. .2..2..1..2. .0..2..2..2
..2..1..2..1. .1..2..1..2. .1..2..2..2. .1..2..1..2. .1..2..1..2
..1..2..2..2. .2..2..2..2. .2..2..2..1. .2..2..2..2. .2..2..2..2
..2..2..1..2. .1..2..2..1. .1..2..2..2. .1..2..1..2. .1..2..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 13 2016
STATUS
approved