A206116 Number of (n+1) X 7 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.

973388, 3048096, 10792800, 157206240, 1990281312, 24408220320, 373319837280, 4839970998240, 59527064527200, 912767002149600, 11833729090696800, 145543672769004000, 2231715320255772000, 28933467626753676000

Offset

1,1

Comments

Column 6 of A206118.

Links

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

Formula

Empirical: a(n) = 2445*a(n-3) for n>9.

Example

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

Crossrefs

Sequence in context: A178292 A237337 A230030 * A230538 A254089 A254096

Adjacent sequences: A206113 A206114 A206115 * A206117 A206118 A206119

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved