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!)
A220938 Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..2 4Xn array 0
1, 37, 556, 9107, 172904, 2876430, 49406891 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 4 of A220935
LINKS
EXAMPLE
Some solutions for n=3
..0..0..1....0..0..0....0..0..0....0..0..1....0..0..1....0..1..0....0..1..1
..0..1..1....0..0..0....0..0..0....1..1..0....1..0..1....1..0..0....0..0..0
..0..0..1....0..1..0....0..1..0....0..1..1....1..0..0....0..1..1....0..1..1
..1..1..0....0..1..0....1..1..0....0..0..0....0..1..0....1..1..0....0..0..0
CROSSREFS
Sequence in context: A006303 A219440 A219141 * A221292 A231514 A156226
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 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 March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)