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A210827 Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having two distinct values, and new values 0..3 introduced in lower triangle row major order 0
3, 29, 548, 18908, 1182512, 131061397, 25883001692, 9078760225423, 5673881364653895, 6325974204854627570, 12606596349780734850457, 44979541448033730855929795 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A113871 A186451 A248828 * A092251 A304553 A326337

Adjacent sequences:  A210824 A210825 A210826 * A210828 A210829 A210830

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2012

STATUS

approved

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Last modified July 8 04:16 EDT 2020. Contains 335504 sequences. (Running on oeis4.)