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A268122
Number of 6Xn arrays containing n copies of 0..6-1 with every element equal to or 1 greater than any north or west neighbors modulo 6 and the upper left element equal to 0.
0
1, 2, 5, 15, 67, 761, 24745, 726627, 15303976, 251565608, 3466082679, 42227611356, 474756482065, 5136476071361
OFFSET
1,2
COMMENTS
Row 6 of A268115.
EXAMPLE
Some solutions for n=7
..0..0..1..2..3..4..5....0..1..1..2..3..4..4....0..1..2..2..3..4..4
..1..1..1..2..3..4..5....1..2..2..3..4..5..5....1..2..2..3..4..5..5
..2..2..2..3..4..5..0....1..2..2..3..4..5..5....1..2..3..4..5..0..0
..2..2..3..4..5..0..1....1..2..3..4..5..0..0....1..2..3..4..5..0..1
..3..3..4..4..5..0..1....2..3..4..5..0..0..1....2..3..4..5..5..0..1
..3..4..5..5..0..0..1....3..3..4..5..0..0..1....3..3..4..5..0..0..1
CROSSREFS
Cf. A268115.
Sequence in context: A268123 A158079 A090091 * A133645 A090130 A090140
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2016
STATUS
approved