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!)
A240650 Number of n X n 0..1 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..1 introduced in row major order 0
1, 2, 9, 91, 2456, 184819, 37066859, 18940533171, 24272278810439, 77660940030730106 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A240656
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..0..1....0..0..1..1....0..1..0..0....0..0..0..1
..0..1..0..0....0..0..0..0....0..0..1..1....1..0..0..0....0..0..0..0
..0..0..1..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0
..1..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....1..0..0..0
CROSSREFS
Sequence in context: A266293 A368840 A224323 * A356566 A365363 A011804
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2014
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 July 19 10:32 EDT 2024. Contains 374392 sequences. (Running on oeis4.)