A266293 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or northeast neighbor modulo 4 and the upper left element equal to 0.

2, 9, 91, 1233, 18827, 323444, 5826961, 110866391, 2163054304, 43343013317, 881391937160, 18187248704334, 378905566162207, 7966181836169943, 168631785538687281, 3592456489311716500, 76933383114445494985

Offset

1,1

Comments

Row 4 of A266291.

Links

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

Example

Some solutions for n=5
..0..0..3..1..3....0..3..2..2..1....0..0..3..3..1....0..2..0..3..3
..2..2..1..1..1....2..2..2..1..1....2..2..2..1..1....0..2..2..1..3
..0..0..3..3..3....1..0..0..3..3....1..0..0..0..3....2..1..0..3..1
..0..2..2..2..1....0..0..3..3..1....3..3..2..2..1....1..0..2..1..3

Crossrefs

Cf. A266291.

Sequence in context: A216691 A059477 A136553 * A368840 A224323 A240650

Adjacent sequences: A266290 A266291 A266292 * A266294 A266295 A266296

Keyword

nonn

Author

R. H. Hardin, Dec 26 2015

Status

approved