A266906 Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or southwest neighbor modulo 4 and the upper left element equal to 0.

2, 13, 102, 1233, 17773, 295717, 5288444, 100047497, 1969179263, 39719367272, 815220460187, 16949934465627, 355839090710684, 7527987550107025, 160278461733848589, 3431017721283599498, 73794099509198635645

Offset

1,1

Comments

Row 4 of A266904.

Links

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

Example

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

Crossrefs

Cf. A266904.

Sequence in context: A077246 A365148 A371578 * A107000 A046891 A046893

Adjacent sequences: A266903 A266904 A266905 * A266907 A266908 A266909

Keyword

nonn

Author

R. H. Hardin, Jan 05 2016

Status

approved