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A210833 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two or four distinct values, and new values 0..3 introduced in lower triangle row major order 0
3, 33, 798, 39272, 3683671, 640787121, 204615573204, 119576103350570, 127795340782521808, 249802991080797461268 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A247030 A009690 A229513 * A174488 A289695 A124432

Adjacent sequences:  A210830 A210831 A210832 * A210834 A210835 A210836

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2012

STATUS

approved

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Last modified January 24 13:11 EST 2022. Contains 350538 sequences. (Running on oeis4.)