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A206142 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases. 1
81, 246, 7812, 580986, 101596896, 41869995708, 40724629633188, 93574975249028022, 508279521493590763140, 6529777647254616589112172, 198475392061658571459051861720, 14277440032279343277552357109481028 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206150.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..13

EXAMPLE

Some solutions for n=4:

..2..1..0..2..1....0..2..1..2..0....1..2..0..2..0....0..1..0..1..2

..0..2..1..0..2....1..0..2..1..2....0..1..2..1..2....1..0..1..0..1

..1..0..2..1..0....0..2..1..0..1....1..2..0..2..0....0..1..0..1..2

..2..1..0..2..1....1..0..2..1..0....0..1..2..0..2....1..2..1..2..1

..0..2..1..0..2....2..1..0..2..1....1..0..1..2..1....0..1..0..1..2

CROSSREFS

Sequence in context: A044986 A237160 A236886 * A225027 A225020 A219131

Adjacent sequences:  A206139 A206140 A206141 * A206143 A206144 A206145

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 04 2012

STATUS

approved

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Last modified May 23 14:57 EDT 2022. Contains 353975 sequences. (Running on oeis4.)