OFFSET
1,1
COMMENTS
Row 2 of A250729
FORMULA
Empirical: a(n) = 2*a(n-1) +2*a(n-2) -3*a(n-3) for n>4
EXAMPLE
Some solutions for n=4
..0..0..0..0..1....0..0..0..0..1....0..0..0..0..0....1..0..0..0..0
..0..1..0..0..1....0..1..0..0..1....0..0..0..0..0....0..1..0..0..1
..1..0..1..0..1....1..0..1..1..1....1..0..0..1..0....1..0..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 27 2014
STATUS
editing