login
The OEIS is supported by the many generous donors to the OEIS Foundation.
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 WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified November 16 17:22 EST 2024. Contains 377800 sequences.
License Agreements, Terms of Use, Privacy Policy