A187132 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.

0, 1773, 267840, 201302208, 440941355208, 3703181282209854

Offset

1,2

Comments

Diagonal of A187140

Links

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

Example

Some solutions for 4X4
..0..1..1..0....0..1..2..0....2..1..1..0....1..0..2..0....2..1..1..0
..1..1..1..1....1..2..2..2....2..1..0..0....2..1..1..1....1..1..2..2
..1..0..0..0....0..1..1..2....0..1..0..1....0..0..0..2....2..2..1..0
..0..1..2..2....0..2..2..2....1..2..1..2....2..2..1..1....0..2..2..1

Crossrefs

Sequence in context: A385370 A396040 A176478 * A185836 A047826 A143995

Adjacent sequences: A187129 A187130 A187131 * A187133 A187134 A187135

Keyword

nonn

Author

R. H. Hardin, Mar 05 2011

Status

approved