A207217 Number of nX4 0..2 arrays avoiding the pattern z z+1 z in any row or column

69, 4761, 247163, 12584703, 647820815, 33403462497, 1721695415743, 88730578258613, 4572950799187243, 235680064764200747, 12146435820476346225, 626000438753879535467, 32262680221309448337639, 1662747377281516450070519

Offset

1,1

Comments

Column 4 of A207221

Links

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

Example

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

Crossrefs

Sequence in context: A207354 A207985 A207197 * A296785 A363927 A364024

Adjacent sequences: A207214 A207215 A207216 * A207218 A207219 A207220

Keyword

nonn

Author

R. H. Hardin Feb 16 2012

Status

approved