A266682 Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its northwest or northeast neighbor modulo 3 and the upper left element equal to 0.

2, 5, 15, 59, 257, 1205, 5879, 29693, 153097, 806375, 4307317, 23313947, 127420533, 702562447, 3900415155, 21786817517, 122309555899, 689707853981, 3904123962093, 22174631940293, 126322762595339, 721552901977497

Offset

1,1

Comments

Row 3 of A266681.

Links

R. H. Hardin, Table of n, a(n) for n = 1..72

Example

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

Crossrefs

Cf. A266681.

Sequence in context: A048192 A078792 A208808 * A325575 A332248 A030934

Adjacent sequences: A266679 A266680 A266681 * A266683 A266684 A266685

Keyword

nonn

Author

R. H. Hardin, Jan 02 2016

Status

approved