A222503 Number of 4Xn 0..3 arrays with exactly floor(4Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 13, 95, 346, 3915, 43771, 524135, 8524766, 122168747, 2165841197, 32515663543, 574481348902, 8775347781607, 153616441788561, 2375537033236755

Offset

1,2

Comments

Row 4 of A222500

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=4
..0..0..1..2....0..0..0..0....0..0..0..0....0..0..1..0....0..0..0..1
..2..0..0..0....0..0..0..0....0..1..0..1....2..1..1..1....0..0..2..0
..0..0..0..0....0..1..0..0....0..0..0..0....1..1..1..1....0..0..0..0
..0..0..0..0....2..1..0..0....0..0..0..0....1..1..1..1....0..0..0..0

Crossrefs

Sequence in context: A044264 A044645 A153703 * A320282 A366484 A297081

Adjacent sequences: A222500 A222501 A222502 * A222504 A222505 A222506

Keyword

nonn

Author

R. H. Hardin Feb 23 2013

Status

approved