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A208346 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors) 0
1, 15, 1095, 230387, 191586797, 647640659639 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A208353

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A203409 A207980 A131313 * A236329 A129764 A027552

Adjacent sequences:  A208343 A208344 A208345 * A208347 A208348 A208349

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 25 2012

STATUS

approved

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Last modified August 18 21:11 EDT 2022. Contains 356215 sequences. (Running on oeis4.)