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A199254 Number of nX6 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and no element equal to any horizontal or vertical neighbor 0
21, 571, 311216, 8862785, 6888550898, 208100267703, 186725016600685, 5831222792322854 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A199256

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A194022 A183730 A341572 * A199199 A089457 A265631

Adjacent sequences:  A199251 A199252 A199253 * A199255 A199256 A199257

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 04 2011

STATUS

approved

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Last modified December 2 10:53 EST 2021. Contains 349440 sequences. (Running on oeis4.)