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A199141 Number of nXn 0..3 arrays with values 0..3 introduced in row major order and each element equal to one or two horizontal and vertical neighbors 0
0, 3, 132, 125468, 839006010, 44832664800117 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A199149

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

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

..1..1..0..0....2..2..3..3....1..1..1..0....0..0..2..2....2..3..3..0

..2..2..0..3....2..2..0..0....2..0..0..0....2..2..3..2....2..0..0..0

..0..0..3..3....0..0..2..2....2..2..2..2....1..1..3..2....3..3..3..3

CROSSREFS

Sequence in context: A090540 A048796 A213203 * A152435 A239426 A157086

Adjacent sequences:  A199138 A199139 A199140 * A199142 A199143 A199144

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 03 2011

STATUS

approved

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Last modified April 20 23:07 EDT 2014. Contains 240824 sequences.