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A199199 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 every element equal to zero or two horizontal or vertical neighbors 0
21, 571, 342958, 10692835, 9746409872, 329877369234 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A199201

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A183730 A341572 A199254 * A089457 A265631 A009091

Adjacent sequences:  A199196 A199197 A199198 * A199200 A199201 A199202

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 03 2011

STATUS

approved

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Last modified October 18 17:07 EDT 2021. Contains 348068 sequences. (Running on oeis4.)