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.

8, 190, 4588, 112750, 2823604, 70004726, 1748785516, 43705413710, 1092621380500, 27317384777366, 682990333610700, 17076690802445486, 426968760440748852, 10675538566342917910, 266921663443974490508, 6673873780235914735374

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: A354407 A244438 A272529 * A177147 A366150 A251669

Adjacent sequences: A198279 A198280 A198281 * A198283 A198284 A198285

Keyword

nonn

Author

R. H. Hardin Oct 23 2011

Status

approved