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A206310 Number of (n+1)X(n+1) 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero 0
112, 14990, 9841886, 31585648103, 492612276280514, 37329289780655758477, 13716254602125340475868528, 24435414110066461941469656297723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206318

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

..1..1..0..2..1....0..3..2..1..1....1..2..2..1..0....3..3..2..1..1

..3..2..1..3..2....2..1..0..3..2....1..0..3..2..1....2..1..0..3..2

..2..3..2..0..3....3..2..1..0..3....2..1..0..3..2....3..2..1..0..3

..0..1..0..2..0....1..3..2..1..0....0..3..2..0..3....0..3..2..1..0

..1..3..2..0..1....1..0..3..2..1....1..0..3..1..0....2..0..3..2..1

CROSSREFS

Sequence in context: A240229 A187672 A049217 * A331670 A063409 A051366

Adjacent sequences:  A206307 A206308 A206309 * A206311 A206312 A206313

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 06 2012

STATUS

approved

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Last modified December 1 04:02 EST 2021. Contains 349426 sequences. (Running on oeis4.)