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!)
A221485 Number of 3Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without consecutive moves in the same direction 1
0, 16, 50, 1407, 11784, 182524, 2017564, 26614749, 319184574, 4025795483, 49427052472, 615583634915, 7608564525014, 94422452015321, 1169266780165296, 14496003421951958, 179605335059387526, 2226026121739586735 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A221483

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..35

EXAMPLE

Some solutions for n=3

..1..2..0....0..2..1....0..3..0....0..2..0....0..3..0....0..2..0....0..1..0

..0..3..2....1..1..1....2..0..1....2..2..1....1..1..0....1..2..1....2..3..1

..0..1..0....0..3..0....0..3..0....0..2..0....1..2..1....0..2..1....0..2..0

CROSSREFS

Sequence in context: A199809 A121863 A121864 * A204723 A204962 A080860

Adjacent sequences:  A221482 A221483 A221484 * A221486 A221487 A221488

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 17 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 October 23 01:49 EDT 2020. Contains 337962 sequences. (Running on oeis4.)