A206013 Number of (n+1) X (n+1) 0..3 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases.

104, 7688, 1763560, 1312173688, 3222294559864, 26463715503890184, 732416961112609324840, 68720985559450744063171672

Offset

1,1

Comments

Diagonal of A206021.

Links

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

Example

Some solutions for n=3:
..2..2..3..0....3..1..3..1....1..1..3..2....3..0..1..0....1..1..3..3
..3..0..3..1....0..0..3..0....0..2..3..0....1..0..2..2....3..2..2..0
..3..1..2..1....2..1..3..2....1..1..3..2....1..3..3..0....3..0..1..1
..0..1..0..1....2..0..3..0....2..0..0..1....0..0..2..1....1..0..2..3

Crossrefs

Sequence in context: A004393 A286329 A164759 * A187700 A015272 A048920

Adjacent sequences: A206010 A206011 A206012 * A206014 A206015 A206016

Keyword

nonn

Author

R. H. Hardin, Feb 02 2012

Status

approved