A267284 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any southwest or northwest neighbors modulo 4 and the upper left element equal to 0.

6, 5, 24, 137, 1138, 12214, 104742, 741057, 5022782, 35540696, 271621650, 2252475421, 19535278570, 168510129798, 1410939522686, 11518135263919, 93278847927814, 762132469855714, 6339718207407286, 53641859402324039

Offset

1,1

Comments

Row 4 of A267278.

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

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

Crossrefs

Cf. A267278.

Sequence in context: A318547 A082384 A248265 * A228969 A256961 A371253

Adjacent sequences: A267281 A267282 A267283 * A267285 A267286 A267287

Keyword

nonn

Author

R. H. Hardin, Jan 12 2016

Status

approved