A251095 Number of (n+1)X(3+1) 0..1 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element.

129, 1109, 9597, 82814, 713769, 6151051, 53009570, 456842112, 3937123328, 33930621210, 292418287803, 2520096887534, 21718506027532, 187172766061609, 1613078004734497, 13901705381759445, 119806613163586853

Offset: 1

Author

R. H. Hardin, Nov 29 2014

Keywords

• nonn

Comments

Column 3 of A251100

Examples

			Some solutions for n=4
..0..0..1..0....0..1..0..0....0..1..1..1....1..0..0..0....1..1..0..1
..1..0..1..1....0..0..0..0....0..0..1..1....1..1..0..0....0..0..0..1
..0..0..0..1....0..0..0..0....1..0..0..1....0..1..0..0....1..1..0..0
..1..1..0..1....0..0..1..1....0..1..0..0....0..0..1..0....0..1..1..0
..0..1..0..1....1..0..1..1....0..0..0..1....0..0..0..1....0..0..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 16*a(n-1) -90*a(n-2) +285*a(n-3) -577*a(n-4) +763*a(n-5) -652*a(n-6) +352*a(n-7) -112*a(n-8) +16*a(n-9)