A205925 Number of (n+1)X8 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock equal to one, and every 2X2 determinant nonzero

1035724, 25017018, 98991836, 3047588270, 10728448308, 454195592550, 1371965011892, 78896152838142, 203503107838856, 15087999339134950, 33757539378700388, 3044839998379132364, 6051262580845528912

Offset

1,1

Comments

Column 7 of A205926

Links

R. H. Hardin, Table of n, a(n) for n = 1..76

Example

Some solutions for n=4
..3..1..1..0..3..3..1..1....0..1..1..3..2..2..1..3....0..2..0..2..3..2..2..3
..0..1..2..2..2..3..3..1....1..1..2..3..3..1..1..1....2..2..2..2..2..2..3..3
..1..1..1..2..3..3..1..1....1..2..2..2..3..3..1..0....3..2..0..2..0..2..2..3
..2..1..2..2..2..3..3..0....1..1..2..3..3..1..1..1....0..2..2..2..2..2..3..3
..2..2..2..1..2..2..3..3....1..2..2..2..3..0..1..0....2..2..3..0..1..2..2..3

Crossrefs

Sequence in context: A254567 A235722 A115497 * A030084 A030092 A237073

Adjacent sequences: A205922 A205923 A205924 * A205926 A205927 A205928

Keyword

nonn

Author

R. H. Hardin Feb 01 2012

Status

approved