A266827 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west, northwest or southwest neighbor modulo 4 and the upper left element equal to 0.

2, 1, 16, 133, 1236, 15125, 214140, 3105224, 45305350, 742969929, 11800248904, 201592461569, 3280672926610, 56851823849846, 940874482142408, 16397055755822665, 274499001396453994, 4794895592704971110

Offset

1,1

Comments

Row 4 of A266825.

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

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

Crossrefs

Cf. A266825.

Sequence in context: A012963 A013120 A012968 * A316226 A352138 A160468

Adjacent sequences: A266824 A266825 A266826 * A266828 A266829 A266830

Keyword

nonn

Author

R. H. Hardin, Jan 04 2016

Status

approved