A210405 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in row major order

7, 2520, 7380816, 178971208720, 35812807522735456, 59168572189285825092176, 807064033391096001306908915584, 90885346773699848753942253937462269824

Offset

1,1

Comments

Diagonal of A210413

Links

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

Example

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

Crossrefs

Sequence in context: A203382 A249352 A264743 * A203705 A354027 A178172

Adjacent sequences: A210402 A210403 A210404 * A210406 A210407 A210408

Keyword

nonn

Author

R. H. Hardin Mar 21 2012

Status

approved