A186919 Number of (n+1)X6 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

166272, 86388160, 15491352288, 3861027028096, 833994044863296, 193942830390429600, 43448233709038001344, 9921625782478580791520

Offset

1,1

Comments

Column 5 of A186923

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for 3X6
..0..3..2..2..3..2....0..2..2..3..0..1....0..0..2..0..2..3....0..3..3..3..2..1
..0..0..1..2..3..2....0..0..3..3..2..2....0..0..0..0..2..1....0..0..3..3..1..2
..0..0..0..3..2..1....0..0..0..0..0..0....0..0..0..3..3..1....0..0..0..3..1..3

Crossrefs

Sequence in context: A183834 A203274 A061741 * A185803 A250931 A319295

Adjacent sequences: A186916 A186917 A186918 * A186920 A186921 A186922

Keyword

nonn

Author

R. H. Hardin Feb 28 2011

Status

approved