A251096 Number of (n+1)X(4+1) 0..1 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element.

406, 5817, 82814, 1175519, 16697127, 237288487, 3372537762, 47933018061, 681254534234, 9682407527191, 137612328359012, 1955831221215641, 27797479224555547, 395074912980985813, 5615048233207846538

Offset: 1

Author

R. H. Hardin, Nov 29 2014

Keywords

• nonn

Comments

Column 4 of A251100

Examples

			Some solutions for n=3
..0..0..0..1..1....1..0..0..1..1....1..0..1..0..0....1..0..1..0..0
..1..0..0..0..1....1..0..0..0..0....0..0..0..0..1....1..0..0..1..1
..0..0..0..0..0....0..1..0..0..0....1..1..1..0..0....1..0..0..0..1
..1..1..1..0..0....0..0..1..1..0....1..1..1..1..0....1..0..1..0..1
		

Links

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

Formula

Empirical: a(n) = 32*a(n-1) -408*a(n-2) +3073*a(n-3) -15730*a(n-4) +58157*a(n-5) -160070*a(n-6) +333703*a(n-7) -532992*a(n-8) +656691*a(n-9) -625063*a(n-10) +457960*a(n-11) -256393*a(n-12) +108609*a(n-13) -34260*a(n-14) +7752*a(n-15) -1136*a(n-16) +80*a(n-17)