A222849 Number of nX2 0..2 arrays with no more than floor(nX2/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order

1, 7, 51, 391, 2894, 22491, 173099, 1351439, 10562301, 83067164, 654664840, 5177288283, 41027782738, 325853413087, 2592430133475, 20658531950143, 164850585115958, 1317141294092889, 10535656551412625, 84359922128250860

Offset

1,2

Comments

Column 2 of A222853

Links

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

Example

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

Crossrefs

Sequence in context: A147958 A104454 A332936 * A273055 A019472 A219306

Adjacent sequences: A222846 A222847 A222848 * A222850 A222851 A222852

Keyword

nonn

Author

R. H. Hardin Mar 07 2013

Status

approved