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A210828
Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in lower triangle row major order
0
4, 47, 1307, 77587, 9532771, 2382934915, 1203182006883, 1223431341113467, 2503405292687579547, 10310784667022325909483, 85532677566328699199301659, 1430104344703313378401501706139, 48228702523491961059131488089168571
OFFSET
1,1
EXAMPLE
Some solutions for n=3
..0..1..1..1....0..1..0..1....0..1..1..0....0..1..1..1....0..1..2..1
..1..1..1..1....1..0..1..1....1..0..1..0....1..0..1..1....1..1..1..2
..1..1..1..1....0..1..1..1....1..1..0..1....1..1..1..2....2..1..2..2
..1..1..1..2....1..1..1..0....0..0..1..1....1..1..2..1....1..2..2..1
CROSSREFS
Sequence in context: A319833 A006438 A251665 * A361560 A333247 A330039
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 27 2012
STATUS
approved