A206091 Number of (n+1) X 6 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.

13608, 17976, 33792, 131904, 516912, 2156544, 8613504, 34039392, 142331904, 568491264, 2246599872, 9393905664, 37520423424, 148275591552, 619997773824, 2476347945984, 9786189042432, 40919853072384, 163438964434944

Offset

1,1

Comments

Column 5 of A206094.

Links

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

Formula

Empirical: a(n) = 66*a(n-3) for n>8.

Example

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

Crossrefs

Sequence in context: A108418 A232447 A237893 * A218456 A224971 A185471

Adjacent sequences: A206088 A206089 A206090 * A206092 A206093 A206094

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved