A268121 Number of 5Xn arrays containing n copies of 0..5-1 with every element equal to or 1 greater than any north or west neighbors modulo 5 and the upper left element equal to 0.

1, 2, 5, 15, 111, 1687, 23522, 253472, 2290853, 18470974, 140294987, 1065068657, 8679331941, 80007298457, 822840131716, 8854238260868, 94125422868108, 961136731712639, 9379785431020093

Offset

1,2

Comments

Row 5 of A268115.

Links

Table of n, a(n) for n=1..19.

Example

Some solutions for n=6
..0..1..1..2..3..3....0..1..1..2..3..4....0..1..2..2..3..4....0..1..1..2..3..4
..0..1..2..2..3..4....0..1..2..3..4..0....1..1..2..3..4..0....0..1..2..2..3..4
..0..1..2..3..4..0....1..1..2..3..4..0....1..2..3..4..4..0....0..1..2..3..3..4
..1..2..3..4..4..0....1..2..3..3..4..0....2..3..4..0..0..1....0..1..2..3..4..0
..1..2..3..4..4..0....2..2..3..4..4..0....3..3..4..0..1..2....1..2..3..4..4..0

Crossrefs

Cf. A268115.

Sequence in context: A191477 A196196 A266573 * A306794 A111790 A309115

Adjacent sequences: A268118 A268119 A268120 * A268122 A268123 A268124

Keyword

nonn

Author

R. H. Hardin, Jan 26 2016

Status

approved