A206504 Number of (n+1)X(n+1) 0..2 arrays with the number of clockwise edge increases in 2X2 subblocks nondecreasing rightwards and downwards

81, 7737, 2105607, 1483188648, 2671430859687, 12197461566772314, 140477097763717169946

Offset

1,1

Comments

Diagonal of A206512

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A206216 A205056 A186132 * A046172 A123847 A115443

Adjacent sequences: A206501 A206502 A206503 * A206505 A206506 A206507

Keyword

nonn

Author

R. H. Hardin Feb 08 2012

Status

approved