A222681 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

5, 5, 11, 58, 142, 2398, 6463, 146947, 401552, 9871237, 27759999, 675112590, 1962193874, 46428879519, 139050595341, 3201678397354, 9862902257940, 221229238222335, 700012077054917

Offset

1,1

Comments

Row 3 of A222679

Links

Table of n, a(n) for n=1..19.

Example

Some solutions for n=3
..0..1..2....0..1..1....0..0..0....0..0..0....0..0..1....0..1..0....0..0..0
..1..1..1....1..1..1....0..0..0....0..0..0....0..0..0....1..1..1....1..0..0
..1..1..1....1..1..1....0..0..0....0..0..1....0..0..0....1..1..1....0..0..0

Crossrefs

Sequence in context: A242325 A098331 A222575 * A061391 A168336 A123133

Adjacent sequences: A222678 A222679 A222680 * A222682 A222683 A222684

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved