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A205760 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors 0
192, 17674, 9909258, 31592825608, 492612437238998, 37329289868928312037, 13716254602126712440880420, 24435414110066470652645658456176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205768

LINKS

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

EXAMPLE

Some solutions for 5X5

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

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

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

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

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

CROSSREFS

Sequence in context: A154308 A187460 A200209 * A035833 A048616 A206707

Adjacent sequences:  A205757 A205758 A205759 * A205761 A205762 A205763

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 30 2012

STATUS

approved

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Last modified May 30 15:13 EDT 2020. Contains 334726 sequences. (Running on oeis4.)