A224125 Number of 3Xn 0..3 arrays with row sums nondecreasing and column sums unimodal.

20, 1080, 47059, 1703178, 53355889, 1491827492, 38051383139, 899713542225, 19963535397227, 419672473818646, 8421847090410941, 162325525523034609, 3020162740527368685, 54468878788851494328, 955569173872191005683

Offset: 1

Author

R. H. Hardin Mar 31 2013

Keywords

• nonn

Comments

Row 3 of A224123

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..21