A210829 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having three distinct values, and new values 0..3 introduced in lower triangle row major order

1, 16, 576, 49472, 10026880, 4815077632, 5473511562368, 14733719832477184, 93906982985442212608, 1417227544723589396820800

Offset

1,2

Links

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

Example

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

Crossrefs

Sequence in context: A063082 A223197 A089156 * A222845 A187403 A265638

Adjacent sequences: A210826 A210827 A210828 * A210830 A210831 A210832

Keyword

nonn

Author

R. H. Hardin Mar 27 2012

Status

approved