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

192, 17674, 9909258, 31592825608, 492612437238998, 37329289868928312037, 13716254602126712440880420, 24435414110066470652645658456176

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 * A338532 A035833 A048616

Adjacent sequences: A205757 A205758 A205759 * A205761 A205762 A205763

Keyword

nonn

Author

R. H. Hardin Jan 30 2012

Status

approved