A266880 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, southwest or northwest neighbor modulo 4 and the upper left element equal to 0.

2, 7, 76, 943, 12549, 205452, 3751651, 72345624, 1439333469, 29337850346, 606171318095, 12663996785919, 266620124227464, 5654752201437201, 120600246762266928, 2585771905289878628, 55681094061639376374

Offset

1,1

Comments

Row 4 of A266878.

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

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

Crossrefs

Cf. A266878.

Sequence in context: A366407 A144905 A349500 * A320329 A083455 A083829

Adjacent sequences: A266877 A266878 A266879 * A266881 A266882 A266883

Keyword

nonn

Author

R. H. Hardin, Jan 05 2016

Status

approved