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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 21 00:46 EST 2022. Contains 350473 sequences. (Running on oeis4.)