A222501 Number of 2Xn 0..3 arrays with exactly floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order

0, 0, 4, 5, 14, 122, 196, 1861, 4042, 32952, 75324, 618635, 1437882, 11665906, 28055204, 220984129, 550922114, 4208027596, 10854564024, 80459791286, 214468168532, 1543792231764, 4246718020040, 29714960845675, 84228546333542

Offset

1,3

Comments

Row 2 of A222500

Links

R. H. Hardin, Table of n, a(n) for n = 1..45

Example

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

Crossrefs

Sequence in context: A281911 A042535 A222489 * A225204 A363817 A308095

Adjacent sequences: A222498 A222499 A222500 * A222502 A222503 A222504

Keyword

nonn

Author

R. H. Hardin Feb 23 2013

Status

approved