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!)
A207998 Number of nX2 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors). 2
2, 15, 114, 1657, 36401, 1094076, 42436913, 2042803419, 118645071202, 8138047375093, 648222594284197, 59148486677131940, 6113429673418115581, 708972517372901061559, 91508202542991877872978, 13053785934982985242672065 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=4
..0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0....0..0
..0..0....1..1....0..1....0..1....1..0....0..0....1..1....0..0....0..0....0..0
..1..1....1..1....1..1....1..1....1..1....1..1....1..1....1..1....1..2....1..1
..2..1....0..0....0..1....0..2....1..0....1..2....0..2....1..1....3..2....2..2
CROSSREFS
Column 2 of A208001.
Sequence in context: A360432 A074622 A031507 * A246570 A052861 A300910
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2012
EXTENSIONS
Terms a(16) and beyond from Andrew Howroyd, Jul 01 2017
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 19 07:36 EDT 2024. Contains 370956 sequences. (Running on oeis4.)