[seqfan] Re: More fractal trees - and erasures

[Reinhard Zumkeller]

see https://oeis.org/A253580
:-)
Best
Reinhard

2015-01-04 13:00 GMT+01:00 Eric Angelini <Eric.Angelini at kntv.be>:

>
> Hello SeqFans,
>
> Build this easy tree:
>           0
>         1,0,2
>       3,1,0,2,4
>     5,3,1,0,2,4,6
>   7,5,3,1,0,2,4,6,8
> 9,7,5,3,1,0,2,4,6,8,10
> ...
> Get S by concatenating the top row to
> the next one, then to the next one, then
> to the next one, etc.
>
> S=0,1,0,2,3,1,0,2,4,5,3,1,0,2,4,6,7,5,3,1,0,2,4,6,8,9,7,5,...
>
> If you erase in S all pairs of consecutive
> integers, you'll get back S.
>
> Best,
> É.
>
>
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