A198283 Number of 2nX12 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors

16, 700, 31718, 1478756, 70004726, 3337609528, 158791292898, 7572454386112, 361223237102398, 17233549055351780, 822235886561754748, 39230600563964575264, 1871782716035228820002, 89307446755046275015160

Offset

1,1

Comments

Column 6 of A198285

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

Some solutions for n=3
..0..0..0..0..0..0..1..1..1..1..1..1....0..0..1..1..1..1..1..1..1..1..0..0
..0..1..1..1..1..0..1..0..0..2..2..1....0..0..1..2..2..0..0..2..2..1..0..0
..0..1..2..2..1..0..1..0..0..2..2..1....2..2..1..2..2..0..0..2..2..1..2..2
..0..1..2..2..1..0..1..2..2..1..1..1....2..2..1..1..1..2..2..1..1..1..2..2
..0..1..1..1..1..0..1..2..2..1..0..0....1..1..2..2..1..2..2..1..2..2..1..1
..0..0..0..0..0..0..1..1..1..1..0..0....1..1..2..2..1..1..1..1..2..2..1..1

Crossrefs

Sequence in context: A222139 A036513 A123824 * A283534 A294704 A264114

Adjacent sequences: A198280 A198281 A198282 * A198284 A198285 A198286

Keyword

nonn

Author

R. H. Hardin Oct 23 2011

Status

approved