A207354 Number of n X 4 0..2 arrays avoiding the pattern z+1 z+1 z horizontally and z-1 z-1 z vertically.

69, 4761, 244134, 12218660, 607211313, 30147535858, 1498532240063, 74502855991182, 3704761167895267, 184230472617367825, 9161522306169565926, 455590132335964207843, 22655874527055217183480, 1126645426342829794990441

Offset

1,1

Comments

Column 4 of A207358.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..2..2..2..2....2..2..2..2....1..2..2..2....0..2..2..0....2..1..0..2
..2..1..0..2....2..1..0..0....1..2..2..2....1..0..0..0....1..2..2..2
..2..0..0..2....1..1..1..1....1..2..1..1....2..2..2..2....1..0..1..1
..1..0..2..2....2..1..2..2....1..2..1..1....0..0..2..0....0..0..2..0

Crossrefs

Cf. A207358.

Sequence in context: A207210 A206953 A206730 * A207985 A207197 A207217

Adjacent sequences: A207351 A207352 A207353 * A207355 A207356 A207357

Keyword

nonn

Author

R. H. Hardin, Feb 17 2012

Status

approved