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A222490

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

0, 4, 6, 33, 75, 968, 2408, 31222, 77802, 980380, 2576182, 31135264, 86474880, 997925136, 2901220154, 32253476486, 97164153940, 1049389226220, 3251341368326, 34336511340904, 108731869474946, 1128946148580572

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Row 3 of A222488

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for n=4

..0..1..1..1....0..0..1..1....0..0..0..0....0..1..1..1....0..0..0..1

..0..1..1..1....0..0..1..1....0..0..0..0....1..1..1..1....0..0..0..1

..0..1..1..1....0..0..1..1....1..2..0..0....1..1..1..0....0..0..0..1