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A208857 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or left-upward diagonal neighbors 0
1, 11, 5796, 44452082, 4071491223248, 4445765748006060562, 57867813487534623493632032, 8978812485595759770697498996138448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A208864

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A216790 A068730 A257124 * A214162 A167068 A273942

Adjacent sequences:  A208854 A208855 A208856 * A208858 A208859 A208860

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 02 2012

STATUS

approved

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Last modified January 28 21:04 EST 2022. Contains 350664 sequences. (Running on oeis4.)