A186833 Number of (n+2)X4 binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards.

2688, 19904, 147428, 1075071, 6019798, 33731024, 188814612, 897952936, 4272342678, 20338694068, 87016169948, 372379475914, 1594343736734, 6342958109897, 25240403647650, 100475230637492, 379502308464848

Offset

1,1

Comments

Column 2 of A186840

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 6X4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..1..0..0....0..0..1..0....0..0..0..1....0..0..1..1....0..0..0..1
..0..0..0..1....0..1..0..1....0..0..1..1....0..0..1..0....0..0..0..1
..0..1..0..1....1..0..1..0....0..1..0..0....0..0..0..0....1..0..0..1
..0..1..1..1....0..1..1..0....0..1..0..0....1..1..0..1....0..1..1..0
..1..1..1..0....0..1..1..1....0..1..0..1....1..0..1..1....1..1..0..1

Crossrefs

Sequence in context: A157613 A233899 A350184 * A229682 A186937 A185748

Adjacent sequences: A186830 A186831 A186832 * A186834 A186835 A186836

Keyword

nonn

Author

R. H. Hardin, Feb 27 2011

Status

approved