A209857 1/4 the number of (n+1) X 8 0..3 arrays with every 2 X 2 subblock having one or four distinct clockwise edge differences.

3553425, 2383064182, 1538049629157, 1014683000461958, 665390868679472699, 437706800031436404447, 287490532338602681041344, 188980762791958451221301355, 124172412194974480096912519039

Offset

1,1

Comments

Column 7 of A209858.

Links

R. H. Hardin, Table of n, a(n) for n = 1..164

Example

Some solutions for n=4
..1..2..3..1..2..2..3..2....1..3..0..3..0..1..0..0....2..3..0..2..2..2..0..2
..2..0..1..2..0..3..1..3....3..2..3..1..3..0..2..3....3..0..1..3..0..3..3..2
..1..2..3..1..2..2..3..2....2..0..3..0..0..1..3..0....2..0..3..0..2..2..0..0
..2..0..1..2..0..3..1..3....0..3..2..3..1..3..2..2....2..3..1..3..3..0..1..3
..2..3..3..1..2..0..1..0....3..1..3..0..3..0..2..2....0..0..3..0..1..3..3..0

Crossrefs

Cf. A209858.

Sequence in context: A347054 A202570 A348809 * A107349 A198167 A329578

Adjacent sequences: A209854 A209855 A209856 * A209858 A209859 A209860

Keyword

nonn

Author

R. H. Hardin Mar 14 2012

Status

approved