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A205512 Number of (n+1)X(n+1) 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock differing from each horizontal or vertical neighbor 0
81, 2412, 205803, 44160240, 25618992453, 37886453633808, 153727495029223899, 1571194548319712891100 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205520

LINKS

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

EXAMPLE

Some solutions for n=4

..1..2..0..0..1....2..0..1..2..0....1..1..1..0..0....0..1..0..0..2

..2..2..1..1..0....2..2..1..2..1....1..0..2..0..0....1..2..0..0..1

..1..0..0..2..0....1..0..1..0..1....2..1..2..1..0....2..2..1..1..2

..0..0..0..2..1....2..2..0..0..2....1..1..0..0..2....1..0..0..2..2

..2..1..1..0..0....1..0..0..0..1....0..2..0..0..2....0..0..0..1..0

CROSSREFS

Sequence in context: A128832 A085877 A123219 * A297606 A236729 A236147

Adjacent sequences:  A205509 A205510 A205511 * A205513 A205514 A205515

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 28 2012

STATUS

approved

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Last modified July 11 22:52 EDT 2020. Contains 335652 sequences. (Running on oeis4.)