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

1,1

Comments

Column 7 of A201700

Links

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

Example

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

Crossrefs

Sequence in context: A085990 A202065 A036770 * A006821 A165626 A120307

Adjacent sequences: A201696 A201697 A201698 * A201700 A201701 A201702

Keyword

nonn

Author

R. H. Hardin Dec 03 2011

Status

approved