OFFSET
1,1
COMMENTS
Diagonal of A253435
FORMULA
Empirical: a(n) = 3*a(n-1) -2*a(n-2) for n>5
Empirical: a(n) = 9*2^n + 12 for n>3
EXAMPLE
Some solutions for n=4
..0..1..1..1..0....1..1..1..1..1....0..0..1..0..1....0..1..1..1..1
..1..1..1..1..0....1..1..1..1..1....1..0..1..0..1....1..1..1..1..1
..1..1..1..1..0....0..0..0..0..0....1..0..1..0..1....1..1..1..1..1
..1..1..1..1..0....0..0..0..0..0....1..0..1..0..1....0..0..0..0..0
..1..1..1..1..1....1..1..1..1..1....1..0..1..0..1....0..0..0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2014
STATUS
approved