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A207042 Number of (n+1)X(n+1) 0..2 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases 1
81, 270, 750, 2244, 4944, 11712, 35904, 79104, 187392, 574464, 1265664, 2998272, 9191424, 20250624, 47972352, 147062784, 324009984, 767557632, 2353004544, 5184159744, 12280922112, 37648072704, 82946555904, 196494753792 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 22 13:15 EDT 2021. Contains 348170 sequences. (Running on oeis4.)