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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
0
1, 16, 576, 49472, 10026880, 4815077632, 5473511562368, 14733719832477184, 93906982985442212608, 1417227544723589396820800
OFFSET
1,2
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 27 2012
STATUS
approved