A222887 Number of nX4 0..2 arrays with exactly floor(nX4/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.

6, 184, 8986, 465938, 24893100, 1351294947, 74202775749, 4110642829357, 229305087108268, 12863027320889786, 724874553417397463, 41005626962099741403, 2327182744071959475216, 132441294546405471753370

Offset

1,1

Comments

Column 4 of A222889

Links

R. H. Hardin, Table of n, a(n) for n = 1..44

Example

Some solutions for n=3
..0..1..2..1....0..1..2..0....0..1..0..2....0..0..1..0....0..1..0..2
..0..0..1..2....2..0..0..1....2..2..0..2....2..2..0..2....1..2..1..0
..0..0..0..1....0..0..2..1....1..0..1..0....1..1..2..1....1..2..2..2

Crossrefs

Sequence in context: A064120 A041429 A089905 * A012208 A012181 A012224

Adjacent sequences: A222884 A222885 A222886 * A222888 A222889 A222890

Keyword

nonn

Author

R. H. Hardin, Mar 08 2013

Status

approved