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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A204698 Number of n X n 0..2 arrays with no occurence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..2 introduced in row major order 0
1, 14, 1417, 835135, 2389914827, 34925753412578, 2568926644225402978, 954699753721419299486986 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A204705

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A280087 A240703 A240640 * A240773 A131582 A270858

Adjacent sequences:  A204695 A204696 A204697 * A204699 A204700 A204701

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 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 December 5 17:42 EST 2019. Contains 329768 sequences. (Running on oeis4.)