A186835 Number of (n+2)X6 binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards.

74088, 1075071, 15478835, 209888936, 1919555447, 17494747887, 156721188699, 1078797163411, 7406777253003, 50517478604280, 286738174613422, 1624495522791359, 9174202859579047, 45367559809783120, 224059718533213551

Offset

1,1

Comments

Column 4 of A186840

Links

R. H. Hardin, Table of n, a(n) for n = 1..39

Example

Some solutions for 4X6
..0..0..0..0..1..1....0..0..0..1..0..0....0..0..0..0..0..1....0..0..1..0..0..1
..0..1..0..1..1..0....0..0..0..1..1..1....0..1..0..0..1..1....0..0..0..1..1..1
..0..1..1..0..1..0....0..0..1..0..0..1....0..1..1..0..1..0....0..1..1..0..0..1
..0..1..0..0..1..1....0..1..1..0..0..1....0..0..0..1..1..0....0..1..0..0..1..1

Crossrefs

Sequence in context: A172949 A172703 A256731 * A239587 A122065 A079543

Adjacent sequences: A186832 A186833 A186834 * A186836 A186837 A186838

Keyword

nonn

Author

R. H. Hardin, Feb 27 2011

Status

approved