A206002 Number of (n+1) X (n+1) 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to one, and every 2 X 2 determinant nonzero.

24, 300, 2728, 64224, 566288, 32546974, 262845336, 51670233144, 345767017112, 315611607627526, 1611191289726456, 8005845542601521472

Offset

1,1

Comments

Diagonal of A206010.

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
..1..1..1..1..1....2..1..0..2..0....2..1..0..2..2....2..1..0..2..1
..0..1..0..1..2....1..1..2..2..2....0..1..1..1..2....2..2..2..2..0
..1..1..1..1..1....2..1..1..2..1....1..1..2..1..1....1..2..0..2..2
..2..1..0..1..2....2..2..1..1..1....1..2..2..2..0....2..2..2..2..0
..0..1..1..1..1....0..2..2..1..0....2..2..0..2..2....1..2..0..2..2

Crossrefs

Cf. A206010.

Sequence in context: A100130 A014103 A321953 * A000552 A233876 A171742

Adjacent sequences: A205999 A206000 A206001 * A206003 A206004 A206005

Keyword

nonn

Author

R. H. Hardin, Feb 02 2012

Status

approved