Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A068725
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A068725 Number of solenoidal flows (flow in = flow out) in a 6x6 square array with integer velocities -n .. n. +0
17
1, 758541101, 134771061592765, 500885416261650533 (list; graph; listen)
OFFSET

0,2

EXAMPLE

Sample flows (. represents a space):

Numbers in long rows are on cell walls showing velocity rightward.

Numbers in long columns are on cell floors showing velocity downwards.

6x6 cell centers are at the intersection of long rows and long columns.

n=1:

.. 0 . 0 . 0 . 0 . 0 . 0

.0. -1. -1. -1. -1. -1 . 0

.. 1 . 0 . 0 . 0 . 0. -1

.0 . 0. -1. -1. -1 . 0 . 0

.. 1 . 1 . 0 . 0. -1. -1

.0 . 0 . 0. -1 . 0 . 0 . 0

.. 1 . 1 . 1. -1. -1. -1

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

.. 1 . 1 . 0 . 0. -1. -1

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

.. 1 . 0 . 0 . 0 . 0. -1

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

.. 0 . 0 . 0 . 0 . 0 . 0

n=2:

.. 0 . 0 . 0 . 0 . 0 . 0

.0. -2. -1. -1 . 0. -1 . 0

.. 2. -1 . 0. -1 . 1. -1

.0 . 0. -2. -2. -2. -1 . 0

.. 2 . 1 . 0. -1 . 0. -2

.0 . 0. -1. -2. -2 . 0 . 0

.. 2 . 2 . 1. -1. -2. -2

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

.. 2 . 2 . 0 . 0. -2. -2

.0 . 0 . 2 . 2 . 2 . 0 . 0

.. 2 . 0 . 0 . 0 . 0. -2

.0 . 2 . 2 . 2 . 2 . 2 . 0

.. 0 . 0 . 0 . 0 . 0 . 0

CROSSREFS

2 X 2 gives 1, 3, 5, 7..., 3 X 3 gives A068722, 4 X 4 gives A068723, 5 X 5 gives A068724, by velocity limit 1..13 A068726-A068738.

Sequence in context: A035518 A104952 A015370 this_sequence A104932 A118876 A058420

Adjacent sequences: A068722 A068723 A068724 this_sequence A068726 A068727 A068728

KEYWORD

nonn

AUTHOR

Ron Hardin (rhh(AT)cadence.com), Feb 26 2002

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


AT&T Labs Research