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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, 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
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: A013033 A376078 A233130 * A027322 A085447 A078673
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 13 2016
STATUS
approved