Voozh

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

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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