A223676 Number of nX4 0..1 arrays with rows and antidiagonals unimodal.

11, 121, 1118, 9822, 85663, 744272, 6458585, 56030742, 486038270, 4215998078, 36570143008, 317213501163, 2751542844692, 23867162292347, 207026174729348, 1795765890711121, 15576654086308004, 135113465080900087

Offset: 1

Author

R. H. Hardin Mar 25 2013

Keywords

• nonn

Comments

Column 4 of A223680

Examples

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

Links

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

Formula

Empirical: a(n) = 11*a(n-1) -21*a(n-2) +18*a(n-3) -114*a(n-4) +183*a(n-5) -96*a(n-6) +80*a(n-7) -65*a(n-8) +16*a(n-9)