A224121 Number of nX3 0..3 arrays with row sums nondecreasing and column sums unimodal.

50, 1747, 47059, 1070499, 21632718, 400993828, 6962188526, 114852977638, 1818933416948, 27867476494858, 415428832366407, 6052984236034862, 86509041863415952, 1216196228905636823, 16857689384122403297

Offset: 1

Author

R. H. Hardin Mar 31 2013

Keywords

• nonn

Comments

Column 3 of A224123

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..22