[seqfan] Re: Riffle shuffle sequence A051732 needs program and b-file

Olivier Gerard olivier.gerard at gmail.com
Thu Nov 8 17:45:04 CET 2012


Hello Neil,

Nice to see that you are on the net again.

Done for A051733, A217948 with a Mathematica program and a few hundreds of
terms (but not using Riffle, since this is used for inserting things in
lists, not computing their group-theoretic properties). A051732 is under
way.

Olivier



On Thu, Nov 8, 2012 at 4:37 PM, Neil Sloane <njasloane at gmail.com> wrote:

> Dear Seq Fans, A correspondent, Anthony C Robin, wrote to me about
> a sequence arising from riffle shuffles (see A051733, A217948). They both
> need
> more terms. But the basic sequence is A051732, which needs
> a computer program and a b-file, in case someone can help.
> This should be a 2-line program in Magma (or maybe in Mma,
> which does have a Riffle command).
>
> Also, what is the connection between A002326 and A051732? Often one is
> twice the other!
>
> Neil
>
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>


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