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A209366 Number of n X n 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z 0
3, 39, 115, 968, 19434, 677448, 43249360, 5008603698, 1040887695040, 390290619582728, 263701318486632444, 321337793316358945352, 705783458367197689313992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A209374

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A134106 A153875 A082954 * A292542 A212664 A050392

Adjacent sequences:  A209363 A209364 A209365 * A209367 A209368 A209369

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 07 2012

STATUS

approved

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Last modified October 22 22:22 EDT 2020. Contains 337962 sequences. (Running on oeis4.)