[seqfan] Re: guessing doubling formulas for sequences

Joshua Zucker joshua.zucker at gmail.com
Tue Mar 10 16:05:30 CET 2009

On Tue, Mar 10, 2009 at 3:17 AM, Georgi Guninski <guninski at guninski.com> wrote:
> by ``doubling formula'' i mean given $n$ an near neighbors
> $a_n,a_{n+1}...a_{n+k}$ compute a_{2 n}

In some sequences, a_{2n} comes easily from a_{n-1} and a_n, so
perhaps you should include a term or two before a_n also.  Though
maybe you handle that difference just by changing the offset of the
sequence by 1?

--Joshua Zucker

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