A186838 Number of (n+2)X9 binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards.

6229504, 188814612, 5699887192, 156721188699, 2571152951156

Offset

1,1

Comments

Column 7 of A186840

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 4X9
..0..0..0..0..0..0..0..1..0....0..0..0..0..0..1..0..0..1
..0..0..0..0..0..1..0..0..1....0..0..0..0..0..0..0..1..1
..0..0..0..0..0..0..0..1..0....0..0..0..0..0..0..0..0..1
..0..0..0..0..1..0..1..1..0....0..0..1..0..1..1..1..1..0

Crossrefs

Sequence in context: A224640 A185887 A306872 * A204654 A138941 A251379

Adjacent sequences: A186835 A186836 A186837 * A186839 A186840 A186841

Keyword

nonn

Author

R. H. Hardin, Feb 27 2011

Status

approved