A210808 Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in lower triangle row major order

0, 14, 627, 39132, 4278728, 876726332, 346344682719, 267613524316520, 407810935423675019, 1231978370206819183695, 7403268643693555489279582, 88704636397578603686451477237, 2122795932194448953322732133844219

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

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

Crossrefs

Sequence in context: A280676 A209103 A283780 * A139196 A336513 A233078

Adjacent sequences: A210805 A210806 A210807 * A210809 A210810 A210811

Keyword

nonn

Author

R. H. Hardin Mar 26 2012

Status

approved