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A199093 Number of n X n 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors 0
1, 6, 280, 732964, 5569129037, 114472439855502 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A199101

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A288796 A199097 A342983 * A163015 A049679 A201139

Adjacent sequences:  A199090 A199091 A199092 * A199094 A199095 A199096

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 02 2011

STATUS

approved

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Last modified July 1 00:05 EDT 2022. Contains 354947 sequences. (Running on oeis4.)