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A268123
Number of 7Xn arrays containing n copies of 0..7-1 with every element equal to or 1 greater than any north or west neighbors modulo 7 and the upper left element equal to 0.
0
1, 2, 5, 15, 67, 457, 9204, 586844, 36708187, 1582675968, 49970797654, 1250823466190
OFFSET
1,2
COMMENTS
Row 7 of A268115.
EXAMPLE
Some solutions for n=8
..0..0..0..1..1..2..3..4....0..0..1..1..1..2..3..4....0..0..1..2..3..3..4..5
..0..0..1..1..2..3..4..5....0..1..2..2..2..3..4..5....0..1..1..2..3..4..5..6
..0..1..1..2..3..4..5..6....0..1..2..3..3..4..5..5....0..1..2..3..4..5..5..6
..1..2..2..3..4..5..5..6....1..1..2..3..4..5..6..6....1..1..2..3..4..5..6..0
..2..2..3..4..5..6..6..6....1..2..3..4..4..5..6..6....2..2..3..4..5..6..6..0
..2..3..4..4..5..6..6..0....2..3..4..5..5..6..0..0....2..3..4..4..5..6..0..1
..3..3..4..5..5..6..0..1....3..4..5..6..6..6..0..0....2..3..4..5..6..6..0..1
CROSSREFS
Cf. A268115.
Sequence in context: A031154 A270534 A268116 * A158079 A090091 A268122
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 26 2016
STATUS
approved