The On-Line Encyclopedia of Integer Sequences (OEIS)

A207042 revision #6

A207042

Number of (n+1)X(n+1) 0..2 arrays with every 2X3 or 3X2 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

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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

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