A206113 Number of (n+1) X 4 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.

6028, 22624, 88596, 520800, 2408480, 10792800, 59892000, 276975200, 1241172000, 6887580000, 31852148000, 142734780000, 792071700000, 3662997020000, 16414499700000, 91088245500000, 421244657300000, 1887667465500000

Offset

1,1

Comments

Column 3 of A206118.

Links

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

Formula

Empirical: a(n) = 115*a(n-3) for n>6.

Example

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

Crossrefs

Sequence in context: A031605 A239176 A236975 * A237864 A031821 A203352

Adjacent sequences: A206110 A206111 A206112 * A206114 A206115 A206116

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved