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A210828 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in lower triangle row major order 0
4, 47, 1307, 77587, 9532771, 2382934915, 1203182006883, 1223431341113467, 2503405292687579547, 10310784667022325909483, 85532677566328699199301659, 1430104344703313378401501706139, 48228702523491961059131488089168571 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A319833 A006438 A251665 * A333247 A330039 A141040

Adjacent sequences:  A210825 A210826 A210827 * A210829 A210830 A210831

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2012

STATUS

approved

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Last modified July 13 12:30 EDT 2020. Contains 335687 sequences. (Running on oeis4.)