A223145 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..2 order

2, 31, 211, 4065, 23376, 487176, 2859044, 61675900, 371133369, 8139180914, 49841557459, 1103204549801, 6833901039820, 152165504230294, 950031309571622, 21243203251932990, 133380148664076565, 2991998436727716610

Offset

1,1

Comments

Column 3 of A223149

Links

R. H. Hardin, Table of n, a(n) for n = 1..157

Example

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

Crossrefs

Sequence in context: A343830 A137626 A134179 * A188225 A164676 A004307

Adjacent sequences: A223142 A223143 A223144 * A223146 A223147 A223148

Keyword

nonn

Author

R. H. Hardin Mar 16 2013

Status

approved