A209850 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences

25, 2829, 1386131, 3111914707, 31192434742293, 1413503057063618368, 287490532338602681041344, 263539796114390477346345246841

Offset

1,1

Comments

Diagonal of A209858

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A145246 A082488 A363865 * A014797 A077519 A078215

Adjacent sequences: A209847 A209848 A209849 * A209851 A209852 A209853

Keyword

nonn

Author

R. H. Hardin Mar 14 2012

Status

approved