How about this one?

   }:#/.=i. 4
1 2 3 4 3 2

Marshall

On Mon, Jun 30, 2014 at 10:26:50AM -0400, Henry Rich wrote:
> Also
> 
>    (,#\.)@i.&.<: 4
> 1 2 3 4 3 2
> 
> Henry Rich
> 
> On 6/30/2014 10:11 AM, Marshall Lochbaum wrote:
> >People have addressed the reshaping part of this, but a rather nice way
> >to generate the base sequence is:
> >
> >    ((],-)i.)&.<: 4
> >1 2 3 4 3 2
> >    ((],-)i.)&.<: 8
> >1 2 3 4 5 6 7 8 7 6 5 4 3 2
> >
> >Marshall
> >
> >On Fri, Jun 27, 2014 at 12:18:09AM -0500, Kip Murray wrote:
> >>Hold up your right hand with its back toward you and number the forefinger
> >>through little finger 1 through 4.  (I suppose the thumb has index 0.)  Now
> >>try finger tapping this pattern:
> >>
> >>1 2 3 4
> >>3 2 1 2
> >>3 4 3 2
> >>1 2 3 4
> >>3 2 1 2
> >>3 4 3 2
> >>
> >>Write a J expression to produce this pattern.
> >>
> >>--Kip Murray
> >>
> >>
> >>--
> >>Sent from Gmail Mobile
> >>----------------------------------------------------------------------
> >>For information about J forums see http://www.jsoftware.com/forums.htm
> >----------------------------------------------------------------------
> >For information about J forums see http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
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