A267405 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any north, west or northwest neighbors modulo 4 and the upper left element equal to 0.

1, 1, 1, 2, 6, 38, 220, 1182, 5244, 21677, 83121, 317190, 1238406, 5171963, 23008470, 106902558, 502056620, 2337251474, 10681338960, 47951784552, 212639292310, 939284216977, 4165475057853, 18644903265192, 84352282521820

Offset

1,4

Comments

Row 4 of A267401.

Links

R. H. Hardin, Table of n, a(n) for n = 1..34

Example

Some solutions for n=8
..0..0..0..1..1..2..2..3....0..1..2..2..3..0..0..0....0..1..2..2..2..2..3..0
..0..0..1..1..1..2..3..3....1..1..2..2..3..0..0..1....1..1..2..2..3..3..3..0
..0..1..1..2..2..2..3..3....2..2..2..2..3..0..1..1....1..1..2..3..3..3..0..0
..0..1..2..2..3..3..3..0....3..3..3..3..3..0..1..1....1..1..2..3..0..0..0..1

Crossrefs

Cf. A267401.

Sequence in context: A186648 A013033 A233130 * A027322 A085447 A078673

Adjacent sequences: A267402 A267403 A267404 * A267406 A267407 A267408

Keyword

nonn

Author

R. H. Hardin, Jan 13 2016

Status

approved