OFFSET
1,1
COMMENTS
Column 2 of A267966.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 21*a(n-1) -153*a(n-2) +263*a(n-3) +2094*a(n-4) -9792*a(n-5) -2752*a(n-6) +86256*a(n-7) -85536*a(n-8) -338048*a(n-9) +554496*a(n-10) +571392*a(n-11) -1335296*a(n-12) -98304*a(n-13) +1179648*a(n-14) -524288*a(n-15).
EXAMPLE
Some solutions for n=6
..0..1....0..0....1..2....2..0....0..1....1..2....0..1....1..2....2..2....0..0
..1..0....1..2....0..1....0..1....1..0....0..1....2..0....0..0....0..0....1..0
..0..1....0..1....0..1....1..1....2..2....1..2....2..1....1..0....0..0....0..2
..2..1....2..1....1..2....0..0....1..1....0..0....0..2....2..2....1..1....2..1
..0..2....0..0....0..2....2..1....0..0....2..2....2..0....1..2....0..2....0..2
..0..0....1..1....2..1....1..0....2..2....0..0....0..2....0..1....2..0....1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 22 2016
STATUS
approved