A223121 Number of nX3 0..2 arrays with no more than floor(nX3/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

2, 64, 1154, 33604, 622568, 18539512, 354680696, 10596201904, 206498940320, 6177157242496, 121870726469408, 3647201710914880, 72609560768633600, 2173014662504367232, 43562628977274881408, 1303500230968158953728

Offset

1,1

Comments

Column 3 of A223126

Links

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

Example

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

Crossrefs

Sequence in context: A299835 A299724 A047707 * A134939 A217268 A122603

Adjacent sequences: A223118 A223119 A223120 * A223122 A223123 A223124

Keyword

nonn

Author

R. H. Hardin Mar 15 2013

Status

approved