A223816 Number of 2Xn 0..2 arrays with row sums nondecreasing and column sums unimodal.

6, 50, 337, 1922, 9783, 45537, 198252, 817482, 3229096, 12308970, 45575437, 164673074, 582981253, 2028408899, 6954637113, 23545924195, 78860147938, 261655333573, 861137618468, 2814055941811, 9138890924393, 29517256515379

Offset: 1

Author

R. H. Hardin Mar 27 2013

Keywords

• nonn

Comments

Row 2 of A223815

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..143