[seqfan] Re: About triangles of numbers in OEIS
Alonso Del Arte
alonso.delarte at gmail.com
Mon Sep 5 23:24:37 CEST 2011
There have been a few cases in which I did not submit a number triangle with
0th column because I saw the OEIS already had the number triangle without
the 0th column. Not wanting to burden Neil back in those days when he was
the only one processing new sequences, I was probably not the only one to
hold back on such triangles.
At the moment I can't recall any such specific triangles, but anyone is
welcome to look for them and send them in. Who knows, you might refresh my
memory.
Al
On Mon, Sep 5, 2011 at 9:44 AM, N. J. A. Sloane <njas at research.att.com>wrote:
> Dear Sequence Fans and Editors
>
> There are many examples in mathematics where a triangle can be written in
> two ways, as
> (these are the Stirling numbers of the second kind, but there are a huge
> number
> of similar examples):
>
> either
>
> 1
> 0 1
> 0 1 1
> 0 1 3 1
> 0 1 7 6 1
> ...
>
> or, omitting the 0-th column, as
>
> 1
> 1 1
> 1 3 1
> 1 7 6 1
> ...
>
> Triangles are read by rows to become an OEIS entry.
> These become different sequences:
> Either 1 0 1 0 1 1 0 1 3 1 0 1 7 6 1 ...
> or 1 1 1 1 3 1 1 7 6 1 ...
>
> It is the OEIS policy to include BOTH versions, with cross-references
> between them.
>
> Please do not start deleting any of these entries.
>
> I am writing this because A137432 should not have been deleted. Especially
> since I had recently edited it. DON'T DO THIS.
>
> NJAS
>
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