A223778 Number of nX3 0..1 arrays with row sums unimodal and column sums inverted unimodal

7, 53, 330, 1809, 8940, 41257, 180670, 756800, 3066706, 12093628, 46563397, 175879412, 653526033, 2392564820, 8651185991, 30941217363, 109551653219, 384528798543, 1339204256650, 4630162104037, 15905909415604, 54322204287215

Offset

1,1

Comments

Column 3 of A223782

Links

R. H. Hardin, Table of n, a(n) for n = 1..116

Example

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

Crossrefs

Sequence in context: A141911 A200766 A056590 * A223712 A065542 A279269

Adjacent sequences: A223775 A223776 A223777 * A223779 A223780 A223781

Keyword

nonn

Author

R. H. Hardin Mar 27 2013

Status

approved