quasi
Posts:
9,080
Registered:
7/15/05
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Re: What is the next number in this series?
Posted:
Feb 9, 2012 11:07 AM
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On Thu, 09 Feb 2012 16:48:16 +0100, AP
<marc.pichereau@wanadoo.fr.invalid> wrote:
>On Wed, 8 Feb 2012 20:47:16 -0800 (PST), Slick itler
><toseriously@gmail.com> wrote:
>
>>1,2,8, ...
> why not 64 ?
>because 2^((n-1)n/2)
>is 1 for n=1
>is 2 for n=2
>is 8 for n=3
>is 64 for n=4
Sure, that works.
An OEIS search also yields this one
(2n)!!
as well as more than 2000 other sequences matching the
initial terms 1,2,8.
But in fact, for any value of a_4, the sequence
1,2,8,a_4
can be matched by an appropriately chosen expression for a_n.
quasi
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