login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A221294 Equals two maps: number of 6Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 6Xn array 0
1, 351, 19996, 1686304, 143511784, 10344276279 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 6 of A221290

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=3

..0..1..0....0..0..0....0..0..1....0..0..1....0..0..1....0..1..1....0..1..0

..0..1..1....0..0..0....0..1..0....1..0..1....0..1..0....0..1..0....1..1..0

..1..0..1....1..0..0....0..0..0....0..0..0....1..1..0....0..1..1....0..0..1

..0..0..0....0..1..0....1..1..0....0..0..1....0..0..0....0..1..0....0..1..0

..0..1..1....0..0..0....0..1..1....1..0..1....1..1..0....1..1..0....1..1..0

..1..1..0....1..1..0....1..1..0....0..1..0....1..1..0....0..0..0....1..0..0

CROSSREFS

Sequence in context: A264426 A231707 A220333 * A220686 A167820 A145633

Adjacent sequences:  A221291 A221292 A221293 * A221295 A221296 A221297

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 09 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 30 07:18 EDT 2021. Contains 346348 sequences. (Running on oeis4.)