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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
1
0, 14, 627, 39132, 4278728, 876726332, 346344682719, 267613524316520, 407810935423675019, 1231978370206819183695, 7403268643693555489279582, 88704636397578603686451477237, 2122795932194448953322732133844219
OFFSET
1,2
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 26 2012
STATUS
approved