A206090 Number of (n+1) X 5 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.

3564, 5952, 13344, 48816, 131904, 444480, 1645920, 4484736, 15112320, 55961280, 152481024, 513818880, 1902683520, 5184354816, 17469841920, 64691239680, 176268063744, 593974625280, 2199502149120, 5993114167296, 20195137259520

Offset

1,1

Comments

Column 4 of A206094.

Links

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

Formula

Empirical: a(n) = 34*a(n-3) for n>7.

Example

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

Crossrefs

Sequence in context: A204607 A204600 A204599 * A357590 A071144 A204417

Adjacent sequences: A206087 A206088 A206089 * A206091 A206092 A206093

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved