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.

1, 2, 5, 15, 67, 761, 24745, 726627, 15303976, 251565608, 3466082679, 42227611356, 474756482065, 5136476071361

Offset

1,2

Comments

Row 6 of A268115.

Links

Table of n, a(n) for n=1..14.

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

Adjacent sequences: A268119 A268120 A268121 * A268123 A268124 A268125

Keyword

nonn

Author

R. H. Hardin, Jan 26 2016

Status

approved