A210833 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two or four distinct values, and new values 0..3 introduced in lower triangle row major order

3, 33, 798, 39272, 3683671, 640787121, 204615573204, 119576103350570, 127795340782521808, 249802991080797461268

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A247030 A009690 A229513 * A174488 A289695 A124432

Adjacent sequences: A210830 A210831 A210832 * A210834 A210835 A210836

Keyword

nonn

Author

R. H. Hardin Mar 27 2012

Status

approved