A222451 Number of nX3 0..1 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order

0, 2, 2, 17, 27, 194, 467, 2375, 6320, 31706, 84949, 426134, 1133626, 5776492, 15176513, 78547862, 204559282, 1071259196, 2775207035, 14655072445, 37875592694, 201114091282, 519500141148, 2768445005172, 7154712147158

Offset

1,2

Comments

Column 3 of A222456

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

Crossrefs

Sequence in context: A002567 A238289 A206095 * A376245 A000528 A260478

Adjacent sequences: A222448 A222449 A222450 * A222452 A222453 A222454

Keyword

nonn

Author

R. H. Hardin Feb 20 2013

Status

approved