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A210819 Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having one, two or three distinct values, and new values 0..3 introduced in lower triangle row major order 1
0, 49, 23161, 22911278, 69542484194, 729154389280269, 27471650645869518237, 3762964490348482852461426, 1879310211105558770807436764190, 3424003001550934968214802269585406825 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..11

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A013741 A178190 A319941 * A173171 A100418 A351443

Adjacent sequences:  A210816 A210817 A210818 * A210820 A210821 A210822

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2012

STATUS

approved

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Last modified September 26 23:44 EDT 2022. Contains 357051 sequences. (Running on oeis4.)