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!)
A230802 Number of nX4 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, and upper left element zero 1
0, 16, 40, 1370, 10448, 183088, 2045378, 29175688, 365502344, 4913369536, 63632416648, 840894973402, 10994101352914, 144572017467922, 1895295043605416, 24887788287735872, 326523191949148616 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 4 of A230805
LINKS
FORMULA
Empirical recurrence of order 68 (see link above)
EXAMPLE
Some solutions for n=4
..0..1..0..3....0..1..3..2....0..1..2..3....0..1..1..2....0..3..0..1
..3..2..1..2....3..2..0..1....3..2..1..0....3..2..0..3....1..2..1..2
..3..0..1..2....2..1..0..3....3..0..2..1....1..0..2..1....0..3..0..3
..2..1..0..3....3..0..1..2....2..1..3..0....2..3..3..0....3..2..1..2
CROSSREFS
Sequence in context: A300901 A174086 A174081 * A100958 A246344 A044093
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 30 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 19 05:50 EDT 2024. Contains 374389 sequences. (Running on oeis4.)