A223818 Number of 4 X n 0..2 arrays with row sums nondecreasing and column sums unimodal.

15, 867, 43941, 1941904, 76453838, 2740448352, 91020540767, 2837847226191, 83919692408722, 2372632276864454, 64552746518391559, 1698928155067259979, 43440043738459660061, 1082941619670703392975

Offset: 1

Author

R. H. Hardin, Mar 27 2013

Keywords

• nonn

Comments

Row 4 of A223815.

Examples

			Some solutions for n=3
..1..1..0....0..1..0....0..0..1....1..2..0....2..1..0....0..0..1....1..1..1
..0..2..0....0..2..0....0..2..1....1..0..2....2..0..1....1..0..0....0..2..2
..0..2..1....1..2..2....2..1..0....1..1..1....1..2..0....1..1..1....1..2..2
..1..2..1....2..2..2....2..1..2....1..2..0....2..0..1....1..2..2....2..2..1
		

Crossrefs

Cf. A223815.