A210069 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one or three distinct clockwise edge differences

33, 7653, 11333893, 114628150378, 7804233177145593, 3585439186083048636774, 11099179467499737412764448230, 231524919565338418309736640383814198

Offset

1,1

Comments

Diagonal of A210077

Links

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

Example

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

Crossrefs

Sequence in context: A183551 A114071 A330134 * A316777 A057981 A219563

Adjacent sequences: A210066 A210067 A210068 * A210070 A210071 A210072

Keyword

nonn

Author

R. H. Hardin Mar 17 2012

Status

approved