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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
0
81, 7737, 2105607, 1483188648, 2671430859687, 12197461566772314, 140477097763717169946
OFFSET
1,1
COMMENTS
Diagonal of A206512
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 08 2012
STATUS
approved