A186837 Number of (n+2)X8 binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards.

1421952, 33731024, 798816802, 17494747887, 235234097572, 3176962520030

Offset

1,1

Comments

Column 6 of A186840

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4X8
..0..0..0..0..0..0..1..0....0..0..1..0..0..0..1..0....0..0..0..0..0..1..0..0
..0..0..1..0..0..1..0..1....0..0..1..0..0..1..0..1....0..0..0..0..1..1..0..1
..0..0..1..0..1..1..0..1....0..0..0..0..0..1..0..0....0..0..1..0..1..1..0..1
..0..1..1..1..1..1..1..1....0..0..1..1..1..1..1..1....0..1..1..1..1..1..1..1

Crossrefs

Sequence in context: A064871 A237397 A301557 * A054852 A242824 A204288

Adjacent sequences: A186834 A186835 A186836 * A186838 A186839 A186840

Keyword

nonn

Author

R. H. Hardin, Feb 27 2011

Status

approved