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A206686 Number of n X n 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order 0
1, 4, 44, 916, 31504, 1915580, 208563912, 41832855136, 15644344542416, 10971573350181154 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A206692

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A144004 A240318 A227656 * A302909 A053333 A301942

Adjacent sequences:  A206683 A206684 A206685 * A206687 A206688 A206689

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 11 2012

STATUS

approved

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Last modified September 24 17:09 EDT 2020. Contains 337321 sequences. (Running on oeis4.)