login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A220334 Equals two maps: number of 7Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 7Xn array 0
1, 1081, 84196, 10004541, 1026529800, 119808040854 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 7 of A220328

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A077740 A078214 A251199 * A221295 A220687 A188240

Adjacent sequences:  A220331 A220332 A220333 * A220335 A220336 A220337

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 10 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 20 02:34 EST 2019. Contains 329323 sequences. (Running on oeis4.)