A207042 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.

81, 270, 750, 2244, 4944, 11712, 35904, 79104, 187392, 574464, 1265664, 2998272, 9191424, 20250624, 47972352, 147062784, 324009984, 767557632, 2353004544, 5184159744, 12280922112, 37648072704, 82946555904, 196494753792

Offset

1,1

Comments

Diagonal of A207050.

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Example

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

Crossrefs

Cf. A207050.

Sequence in context: A237227 A206094 A202333 * A206087 A236809 A236802

Adjacent sequences: A207039 A207040 A207041 * A207043 A207044 A207045

Keyword

nonn

Author

R. H. Hardin, Feb 14 2012

Status

approved