A210816 Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having three distinct values, and new values 0..3 introduced in lower triangle row major order

0, 12, 551, 49223, 10022877, 4814973856, 5473507216675, 14733719538503109, 93906982953302482787, 1417227544717910923643049

Offset

1,2

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A163046 A193381 A224539 * A133415 A192602 A227143

Adjacent sequences: A210813 A210814 A210815 * A210817 A210818 A210819

Keyword

nonn

Author

R. H. Hardin Mar 27 2012

Status

approved