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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

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

Adjacent sequences:  A210804 A210805 A210806 * A210808 A210809 A210810

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 26 2012

STATUS

approved

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Last modified May 7 08:12 EDT 2021. Contains 343636 sequences. (Running on oeis4.)