A188303 Number of (n+1)X(n+1) binary arrays with every 2X2 subblock sum equal to exactly one or two horizontal and vertical neighbor 2X2 subblock sums

0, 128, 3784, 321696, 53468700, 21615769428

Offset

1,2

Comments

Diagonal of A188311

Links

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

Example

Some solutions for 3X3
..1..1..1....1..0..1....0..1..0....0..1..1....0..1..0....0..1..1....1..1..0
..1..1..0....1..1..0....0..1..0....1..0..0....0..1..1....1..0..1....0..0..1
..1..1..1....0..1..0....1..0..1....0..0..1....0..1..0....0..1..1....1..0..0

Crossrefs

Sequence in context: A191899 A191495 A250172 * A283813 A239441 A306412

Adjacent sequences: A188300 A188301 A188302 * A188304 A188305 A188306

Keyword

nonn

Author

R. H. Hardin Mar 27 2011

Status

approved