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A210817 Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in lower triangle row major order 0
0, 14, 784, 81546, 19331276, 10875523234, 14610137114552, 46893872347639870, 359629516042061730940, 6589801210361833609789898 (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..3....0..1..0..3....0..1..2..3....0..1..3..2....0..1..2..1

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

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

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

CROSSREFS

Sequence in context: A203750 A232158 A208254 * A042519 A050983 A183576

Adjacent sequences:  A210814 A210815 A210816 * A210818 A210819 A210820

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2012

STATUS

approved

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Last modified January 17 14:57 EST 2020. Contains 330958 sequences. (Running on oeis4.)