login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A207007 Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column 0
3, 81, 7891, 5174065, 18649387825, 381916401448593, 44164224032234465777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207015

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A223717 A223825 A207222 * A223783 A223969 A207202

Adjacent sequences: A207004 A207005 A207006 * A207008 A207009 A207010

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 2 05:15 EST 2023. Contains 359997 sequences. (Running on oeis4.)