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A267568
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any west or southwest neighbors modulo 4 and the upper left element equal to 0.
1
6, 2, 3, 15, 170, 1614, 11048, 60954, 299110, 1494098, 8772195, 61209175, 450621524, 3191383332, 21167733740, 133174852936, 820343904175, 5126587427874, 33208210014133, 222276340846479, 1507709621631348, 10169384286795946
OFFSET
1,1
COMMENTS
Row 4 of A267562.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..2..3....0..1..2..3....0..1..2..3....0..0..1..2....0..1..2..3
..1..2..3..0....1..1..2..3....1..2..3..0....3..0..1..2....0..1..2..3
..2..3..0..1....1..2..3..0....1..2..3..0....0..1..2..3....0..1..2..3
..3..0..1..2....2..3..0..0....1..2..3..0....1..2..3..3....0..1..2..3
CROSSREFS
Cf. A267562.
Sequence in context: A256632 A201280 A248274 * A182011 A086048 A239578
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 17 2016
STATUS
approved