A222491 Number of 4Xn 0..2 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..2 order

0, 13, 85, 270, 2373, 17095, 145019, 1271237, 12273588, 113823904, 1131311866, 10543094777, 105359579523, 985710462356, 9862145116373, 92538102045091, 925649183459093

Offset

1,2

Comments

Row 4 of A222488

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Sequence in context: A321589 A225129 A297207 * A010025 A001848 A055843

Adjacent sequences: A222488 A222489 A222490 * A222492 A222493 A222494

Keyword

nonn

Author

R. H. Hardin Feb 22 2013

Status

approved