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!)
A220457 Equals one maps: number of n X 3 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, vertical and antidiagonal neighbors in a random 0..1 n X 3 array. 1
4, 22, 108, 691, 3872, 20897, 112582, 605780, 3249132, 17400206, 93125105, 498148634, 2663790130, 14241169579, 76125716517, 406890173406, 2174685548474, 11622471918192, 62113961444133, 331949857443568, 1773988622548460 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A220461.
LINKS
EXAMPLE
Some solutions for n=3
..1..1..1....0..0..0....0..0..0....1..0..0....1..1..1....0..0..0....1..0..1
..0..0..1....0..0..0....1..1..0....1..0..1....0..0..1....0..0..1....1..0..1
..0..1..1....0..0..1....1..1..0....0..0..1....1..0..1....0..1..0....1..0..1
CROSSREFS
Cf. A220461.
Sequence in context: A001436 A224243 A024420 * A108840 A007994 A006651
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 15 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 1 08:46 EST 2024. Contains 370430 sequences. (Running on oeis4.)