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A205990 Number of (n+1)X(n+1) 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to two, and every 2X2 determinant nonzero 0
26, 498, 22612, 2437024, 619044912, 372736115952, 529835251171222, 1784953426699556450, 14217384542435576039962, 268389362522048765430516260, 11988698179720320887135239667414, 1269247322036771438138592002629758982 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205998

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A240190 A001723 A163201 * A230247 A058461 A323492

Adjacent sequences:  A205987 A205988 A205989 * A205991 A205992 A205993

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 02 2012

STATUS

approved

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Last modified May 14 19:53 EDT 2021. Contains 343903 sequences. (Running on oeis4.)