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A199648 Number of n X n 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 0
1, 14, 2584, 3695683, 39209840355, 3083761998081891, 1797997097480559332224, 7771716024559573445914487875 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A199655

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

..0..1..0....0..0..1....0..1..2....0..0..1....0..1..0....0..1..1....0..0..0

..0..0..1....1..0..2....0..1..2....2..2..2....2..0..0....1..2..2....0..1..1

..2..0..1....2..1..0....1..1..0....1..1..2....2..0..1....1..2..1....0..1..0

CROSSREFS

Sequence in context: A080690 A268424 A079918 * A271401 A013719 A145188

Adjacent sequences: A199645 A199646 A199647 * A199649 A199650 A199651

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 08 2011

STATUS

approved

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Last modified March 30 12:42 EDT 2023. Contains 361618 sequences. (Running on oeis4.)