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A210818 Number of (n+1) X (n+1) 0..3 symmetric matrices containing all values 0..3 with every 2 X 2 subblock having two or three distinct values, and new values 0..3 introduced in lower triangle row major order. 0
0, 47, 18769, 15675953, 40094432569, 349773663772607, 10762101043733093559, 1178656962552052684421464, 460402167947340968868291699047, 641654577152679219502203022480885713 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..0..1..2..1....0..1..2..0....0..1..2..0....0..1..0..3....0..1..2..0

..1..0..0..0....1..2..2..2....1..1..2..3....1..2..0..1....1..2..0..1

..2..0..2..3....2..2..1..3....2..2..1..2....0..0..0..0....2..0..0..1

..1..0..3..1....0..2..3..0....0..3..2..0....3..1..0..1....0..1..1..3

CROSSREFS

Sequence in context: A267063 A287225 A033520 * A093940 A237512 A224468

Adjacent sequences:  A210815 A210816 A210817 * A210819 A210820 A210821

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 27 2012

STATUS

approved

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Last modified October 2 01:30 EDT 2022. Contains 357191 sequences. (Running on oeis4.)