OFFSET
1,1
COMMENTS
Column 5 of A224374
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 21*a(n-1) -141*a(n-2) +427*a(n-3) -546*a(n-4) +526*a(n-5) -2124*a(n-6) +3302*a(n-7) +2396*a(n-8) +7504*a(n-9) +580*a(n-10) +1632*a(n-11) for n>13
EXAMPLE
Some solutions for n=3
..1..0..0..0..0....0..1..1..1..0....1..0..0..0..0....1..0..0..0..0
..0..0..2..0..0....2..2..2..1..1....1..2..2..2..2....0..0..1..0..0
..0..2..2..2..1....2..2..2..1..0....2..2..2..2..1....1..2..2..2..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 05 2013
STATUS
approved