A201699 Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.

3, 60, 3838, 607919, 142436489, 27102769900, 3262897246338, 253484699853930, 13657827589827288, 542530203631847499, 16634470482072064655, 407700696414920035296, 8211702473582080609860, 139013768818199221546289

Offset: 1

Author

R. H. Hardin Dec 03 2011

Keywords

• nonn

Comments

Column 7 of A201700

Examples

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

Links

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