login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A210816 Number of (n+1)X(n+1) 0..3 symmetric matrices containing all values 0..3 with every 2X2 subblock having three distinct values, and new values 0..3 introduced in lower triangle row major order 0
0, 12, 551, 49223, 10022877, 4814973856, 5473507216675, 14733719538503109, 93906982953302482787, 1417227544717910923643049 (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..3..3....0..1..1..3....0..1..1..2....0..1..2..1....0..1..1..1

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

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

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

CROSSREFS

Sequence in context: A163046 A193381 A224539 * A133415 A192602 A227143

Adjacent sequences:  A210813 A210814 A210815 * A210817 A210818 A210819

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 27 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 21 10:55 EDT 2019. Contains 322328 sequences. (Running on oeis4.)