A266863 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north or southwest neighbor modulo 4 and the upper left element equal to 0.

2, 39, 999, 31501, 1115170, 41983402, 1645807004, 66428315332, 2741553615797, 115161107816709, 4907346217889770, 211619921457504517, 9217713218166541066, 404959978196608770290, 17923299357990007812631, 798420742078293208625630

Offset

1,1

Comments

Row 4 of A266861.

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

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

Crossrefs

Cf. A266861.

Sequence in context: A042683 A319520 A209632 * A245053 A352021 A177773

Adjacent sequences: A266860 A266861 A266862 * A266864 A266865 A266866

Keyword

nonn

Author

R. H. Hardin, Jan 04 2016

Status

approved