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A210807
Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having two distinct values, and new values 0..2 introduced in lower triangle row major order
1
0, 11, 277, 9113, 481193, 42755401, 6567653211, 1765418657657, 837299786987585, 704286634931475821, 1054562224800265182703, 2818631615739460639296059, 13476057547647842870829487857, 115444002089526684913965405146223
OFFSET
1,2
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..2....0..0..0..0....0..0..1..1....0..1..1..1....0..1..1..1
..1..1..0..0....0..1..1..1....0..1..0..0....1..1..2..2....1..1..2..2
..0..0..1..1....0..1..2..1....1..0..1..1....1..2..2..0....1..2..2..1
..2..0..1..2....0..1..1..1....1..0..1..2....1..2..0..0....1..2..1..2
CROSSREFS
Sequence in context: A203240 A062210 A049080 * A129754 A103547 A171195
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 26 2012
STATUS
approved