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A206120 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors 0
50, 798, 25340, 2501248, 619611200, 372768662926, 529835514016558, 1784953478369789594, 14217384542781343057074, 268389362522364377038143786 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206128

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A223982 A128799 A231835 * A160287 A104672 A086027

Adjacent sequences:  A206117 A206118 A206119 * A206121 A206122 A206123

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 04 2012

STATUS

approved

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Last modified October 7 11:56 EDT 2022. Contains 357270 sequences. (Running on oeis4.)