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

112, 14990, 9841886, 31585648103, 492612276280514, 37329289780655758477, 13716254602125340475868528, 24435414110066461941469656297723

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