A222425 Number of nX2 0..2 arrays with exactly floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.

0, 0, 4, 13, 36, 132, 584, 2054, 7700, 29208, 113024, 428784, 1637248, 6322400, 24241600, 93878180, 360819968, 1402924464, 5410402304, 21069262688, 81508818720, 317854067456, 1233012730240, 4813042237968, 18714480000512

Offset

1,3

Comments

Column 2 of A222430

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A348476 A065297 A067635 * A222189 A003727 A103082

Adjacent sequences: A222422 A222423 A222424 * A222426 A222427 A222428

Keyword

nonn

Author

R. H. Hardin, Feb 19 2013

Status

approved