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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 1
2, 64, 1154, 33604, 622568, 18539512, 354680696, 10596201904, 206498940320, 6177157242496, 121870726469408, 3647201710914880, 72609560768633600, 2173014662504367232, 43562628977274881408, 1303500230968158953728 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)