A198284 Number of 2n X 14 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.

32, 2574, 219060, 19399132, 1748785516, 158791292898

Offset

1,1

Comments

Column 7 of A198285.

Links

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

Example

A solution for n=3:
..0..0..0..0..1..1..1..1..1..1..1..1..0..0
..0..2..2..0..1..0..0..0..0..2..2..1..0..0
..0..2..2..0..1..0..2..2..0..2..2..1..2..2
..0..1..1..0..1..0..2..2..0..1..1..1..2..2
..0..1..1..0..1..0..0..0..0..1..2..2..1..1
..0..0..0..0..1..1..1..1..1..1..2..2..1..1

Crossrefs

Sequence in context: A247999 A222742 A077143 * A230573 A111923 A136246

Adjacent sequences: A198281 A198282 A198283 * A198285 A198286 A198287

Keyword

nonn,more

Author

R. H. Hardin, Oct 23 2011

Status

approved