The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A208315 Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors. 1
1, 13, 2852, 5269968, 82063614224, 10768439015566880, 11907389879137262727680, 110953732239793838864921644288, 8712219181636799263542546576017159296, 5764706550248813633923105729304227646191895040 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A208322.
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..2....0..0..0..1....0..1..2..1....0..0..1..1....0..0..0..1
..1..2..2..1....2..1..0..2....2..2..1..2....2..1..0..1....2..0..1..0
..1..0..1..1....2..0..0..2....0..2..2..2....1..2..2..2....0..2..1..1
..0..0..2..0....1..0..1..2....0..0..2..1....1..0..0..0....2..0..0..1
CROSSREFS
Cf. A208322.
Sequence in context: A203692 A187592 A287036 * A296174 A220642 A260982
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 25 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 May 25 09:23 EDT 2024. Contains 372786 sequences. (Running on oeis4.)