OFFSET
1,1
COMMENTS
Diagonal of A235884
FORMULA
Empirical: a(n) = 10*a(n-1) -35*a(n-2) +50*a(n-3) -24*a(n-4)
EXAMPLE
Some solutions for n=5
..2..1..1..2..2..2....0..0..0..0..0..1....2..2..2..2..0..2....1..0..0..0..1..1
..1..2..2..1..1..1....0..0..0..0..0..1....2..2..2..2..0..2....0..1..1..1..0..0
..2..1..1..2..2..2....0..0..0..0..0..1....0..0..0..0..2..0....0..1..1..1..0..0
..2..1..1..2..2..2....0..0..0..0..0..1....2..2..2..2..0..2....0..1..1..1..0..0
..1..2..2..1..1..1....0..0..0..0..0..1....2..2..2..2..0..2....0..1..1..1..0..0
..2..1..1..2..2..2....0..0..0..0..0..1....0..0..0..0..2..0....0..1..1..1..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 16 2014
STATUS
approved