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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A213794 Number of n X n 0..2 symmetric arrays with every row summing to n 0
1, 3, 13, 169, 5673, 526443, 133721189, 95133854529, 190409704025737 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A213800

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A176315 A290758 A290769 * A239979 A261361 A114317

Adjacent sequences:  A213791 A213792 A213793 * A213795 A213796 A213797

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 20 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 November 17 03:06 EST 2019. Contains 329216 sequences. (Running on oeis4.)