A207046 Number of (n+1)X5 0..2 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases

1416, 1182, 1272, 2244, 3408, 4836, 9144, 13950, 19752, 36912, 55944, 79032, 147648, 223776, 316128, 590592, 895104, 1264512, 2362368, 3580416, 5058048, 9449472, 14321664, 20232192, 37797888, 57286656, 80928768, 151191552, 229146624

Offset

1,1

Comments

Column 4 of A207050

Links

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

Formula

Empirical: a(n) = 4*a(n-3) for n>12

Example

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

Crossrefs

Sequence in context: A143192 A237863 A263671 * A237220 A188099 A252106

Adjacent sequences: A207043 A207044 A207045 * A207047 A207048 A207049

Keyword

nonn

Author

R. H. Hardin Feb 14 2012

Status

approved