A210347 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one, two or three distinct clockwise edge differences

40, 13566, 38415623, 934012605398, 193382034306882852, 341167083547574037214431, 5125371159957295208758939227336, 655672443742537489846231752745295823823

Offset

1,1

Comments

Diagonal of A210355

Links

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

Example

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

Crossrefs

Sequence in context: A119525 A309553 A123381 * A221391 A279578 A159680

Adjacent sequences: A210344 A210345 A210346 * A210348 A210349 A210350

Keyword

nonn

Author

R. H. Hardin Mar 20 2012

Status

approved