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A199640 Number of n X n 0..2 arrays with values 0..2 introduced in row major order and each element equal to one or two horizontal and vertical neighbors 0
0, 3, 112, 29229, 32177372, 176701683386, 4539946639286136 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A199647

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

..0..1..1....0..0..1....0..1..1....0..0..0....0..0..1....0..0..1....0..1..1

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

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

CROSSREFS

Sequence in context: A169996 A054330 A024043 * A221618 A300814 A075051

Adjacent sequences:  A199637 A199638 A199639 * A199641 A199642 A199643

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 08 2011

STATUS

approved

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Last modified September 20 00:14 EDT 2020. Contains 337212 sequences. (Running on oeis4.)