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

1,1

Comments

Row 2 of A223815

Links

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

Example

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

Crossrefs

Sequence in context: A213807 A241781 A272469 * A180880 A308860 A318162

Adjacent sequences: A223813 A223814 A223815 * A223817 A223818 A223819

Keyword

nonn

Author

R. H. Hardin Mar 27 2013

Status

approved