A210333 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having two or three distinct clockwise edge differences

4672093, 8549740834, 15012328786175, 26888341896724303, 48035056424818579234, 85910577682285107137239, 153622523285419300031038131, 274724014890799462317191535828

Offset

1,1

Comments

Column 6 of A210335

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A265448 A272701 A083605 * A069340 A205942 A271142

Adjacent sequences: A210330 A210331 A210332 * A210334 A210335 A210336

Keyword

nonn

Author

R. H. Hardin Mar 20 2012

Status

approved