[seqfan] Re: can anyone extend A006506?

Robert Israel israel at math.ubc.ca
Thu Jun 16 09:13:08 CEST 2011

Yes, Maple syntax changed (quite a few years ago) in that "." which used 
to be a concatenation operator for names is now used for multiplication of
Matrices and Vectors.  The concatenation operator is now "||".
I changed all occurrences of . to || and the result now agrees with the 
current entries.  I'll edit the entry, and add a few more values (up to


On Thu, 16 Jun 2011, N. J. A. Sloane wrote:

> Dear SeqFans, I came across a paper by Stosic et al. which mentions A006506,
> and in fact quotes the Maple program in that entry (in Jnl. Physics A,
> I added the reference).
> So I tried running that Maple program myself, thinking I would
> compute at least a few more terms,
> but to my surprise, the program gives different values from the sequence.
> Yet it is exactly the same program that Stosic quotes.
> I admit I don't understand the Maple program, which came originally
> from Paul Zimmermann. But it isn't working. Maple something changed
> in Maple since 1999? So that the program now gives different answers?
> Can some Maple expert explain what is going on? And compute some
> more terms?
> It looks like a very interesting sequence.
> Neil
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