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A198282 Number of 2n X 10 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors. 1
8, 190, 4588, 112750, 2823604, 70004726, 1748785516, 43705413710, 1092621380500, 27317384777366, 682990333610700, 17076690802445486, 426968760440748852, 10675538566342917910, 266921663443974490508, 6673873780235914735374 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A198285.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..82

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

CROSSREFS

Cf. A198285.

Sequence in context: A163701 A244438 A272529 * A177147 A251669 A158654

Adjacent sequences:  A198279 A198280 A198281 * A198283 A198284 A198285

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 23 2011

STATUS

approved

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Last modified October 15 21:38 EDT 2021. Contains 348034 sequences. (Running on oeis4.)