A209856 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences

492373, 155490654, 47417927307, 14741920546390, 4558499131132306, 1413503057063618368, 437706800031436404447, 135637740882655309176164, 42015985984488346140563741, 13017745880887035269283799043

Offset

1,1

Comments

Column 6 of A209858

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A251972 A034629 A109914 * A234822 A082248 A166196

Adjacent sequences: A209853 A209854 A209855 * A209857 A209858 A209859

Keyword

nonn

Author

R. H. Hardin Mar 14 2012

Status

approved