A222668 Number of nX3 0..2 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..2 order

0, 2, 2, 40, 90, 1336, 3458, 44516, 126476, 1527344, 4599422, 53131172, 167316392, 1872027432, 6086187592, 66611566008, 221500197840, 2388653206624, 8068017360224, 86178588357352, 294198667299936, 3124170165050528

Offset

1,2

Comments

Column 3 of A222673

Links

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

Example

All solutions for n=3
..0..0..0....0..0..1
..0..0..0....0..0..0
..1..0..0....0..0..0

Crossrefs

Sequence in context: A038623 A001121 A202711 * A210246 A116567 A215049

Adjacent sequences: A222665 A222666 A222667 * A222669 A222670 A222671

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved