A185805 Number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock trace equal to some horizontal or vertical neighbor 2 X 2 subblock trace.

10419200, 42093682560, 75902079167968, 166089641496321408, 348593375731473172480

Offset

1,1

Comments

Column 7 of A185807.

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 3 X 8
..0..0..0..2..0..0..2..3....0..0..0..2..2..1..1..3....0..0..0..0..0..1..3..2
..0..0..0..0..1..3..3..3....0..0..0..0..0..0..1..3....0..0..0..0..3..3..3..1
..0..0..0..0..0..2..2..2....0..0..0..0..0..3..3..3....0..0..0..0..0..3..3..3

Crossrefs

Cf. A185807.

Sequence in context: A241791 A234198 A186921 * A306476 A251640 A066870

Adjacent sequences: A185802 A185803 A185804 * A185806 A185807 A185808

Keyword

nonn

Author

R. H. Hardin Feb 04 2011

Status

approved