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A205918 Number of (n+1)X(n+1) 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to one, and every 2X2 determinant nonzero 0
76, 2684, 67372, 7177505, 160958484, 88272553560, 1371965011892, 8711176002158453, 72211646175697736 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205926

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A153177 A166191 A188400 * A261574 A017792 A035733

Adjacent sequences:  A205915 A205916 A205917 * A205919 A205920 A205921

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 01 2012

STATUS

approved

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Last modified March 31 03:08 EDT 2020. Contains 333136 sequences. (Running on oeis4.)