A267743 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any west or northeast neighbors modulo 4 and the upper left element equal to 0.

6, 5, 26, 123, 633, 3428, 18899, 106599, 618585, 3674665, 22190640, 135570897, 835884024, 5196879659, 32568136350, 205609418532, 1306436325774, 8346088687406, 53563228719519, 345155128538327, 2232566289999786

Offset

1,1

Comments

Row 4 of A267742.

Links

R. H. Hardin, Table of n, a(n) for n = 1..31

Example

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

Crossrefs

Cf. A267742.

Sequence in context: A228969 A256961 A371253 * A298155 A219931 A296192

Adjacent sequences: A267740 A267741 A267742 * A267744 A267745 A267746

Keyword

nonn

Author

R. H. Hardin, Jan 20 2016

Status

approved