A209715 1/4 the number of (n+1)X8 0..3 arrays with every 2X2 subblock having distinct clockwise edge differences

3223192, 2118517533, 1308905451923, 830023337140244, 522757733883587522, 330369121707817687620, 208427296314737259382008, 131618147804621095447618893, 83072099151587827914461601665

Offset

1,1

Comments

Column 7 of A209716

Links

R. H. Hardin, Table of n, a(n) for n = 1..178

Example

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

Crossrefs

Sequence in context: A029820 A146976 A251529 * A361613 A235211 A219335

Adjacent sequences: A209712 A209713 A209714 * A209716 A209717 A209718

Keyword

nonn

Author

R. H. Hardin Mar 11 2012

Status

approved