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A205458 Number of (n+1)X(n+1) 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock differing from each horizontal or vertical neighbor 0
256, 34792, 22414008, 69248994984, 1002427910938748, 68862365329186909360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205466

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

..0..3..3..0..1....1..1..3..3..0....0..3..2..1..0....2..0..3..1..1

..0..1..0..0..2....3..1..0..3..2....2..2..3..0..1....2..1..1..2..0

..1..2..0..0..0....1..2..2..0..0....1..3..3..1..1....3..3..2..2..1

..0..3..1..3..1....2..2..2..0..0....1..3..3..0..2....1..0..0..3..0

..1..0..0..1..1....2..2..3..2..0....3..0..1..1..1....3..3..1..1..3

CROSSREFS

Sequence in context: A205362 A206101 A221091 * A206744 A207791 A018798

Adjacent sequences:  A205455 A205456 A205457 * A205459 A205460 A205461

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 27 2012

STATUS

approved

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Last modified August 15 15:31 EDT 2022. Contains 356148 sequences. (Running on oeis4.)