A266905 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west or southwest neighbor modulo 3 and the upper left element equal to 0.

1, 1, 5, 11, 24, 77, 222, 700, 2297, 6869, 21609, 71873, 232180, 750378, 2467891, 8112639, 26801830, 89117472, 296172168, 986748556, 3302475620, 11072842433, 37184910085, 125141998479, 421837425707, 1424270565702, 4816739871914

Offset

1,3

Comments

Row 3 of A266904.

Links

R. H. Hardin, Table of n, a(n) for n = 1..109

Example

Some solutions for n=6
..0..0..0..2..2..1....0..2..1..0..2..2....0..2..1..1..0..2....0..2..1..0..0..2
..0..0..2..2..1..1....2..1..0..0..2..1....0..2..1..1..0..2....2..1..1..0..2..1
..0..2..2..1..1..1....1..0..0..2..1..1....0..2..1..1..0..2....2..1..0..2..1..0

Crossrefs

Cf. A266904.

Sequence in context: A122926 A122925 A021008 * A059358 A296911 A167238

Adjacent sequences: A266902 A266903 A266904 * A266906 A266907 A266908

Keyword

nonn

Author

R. H. Hardin, Jan 05 2016

Status

approved