[seqfan] Re: A019575 challenge

Charles Greathouse charles.greathouse at case.edu
Fri Aug 20 05:55:21 CEST 2010

Yes, good thoughts.  We'd want to have some sort of metadata that lets
the graphing system know how to do the 1D -> 2D translation: list by
rows, list by antidiagonals, ...?

Charles Greathouse
Case Western Reserve University

On Thu, Aug 19, 2010 at 11:04 PM, Donald Alan Morrison
<donmorrison at gmail.com> wrote:
> One visualization possibility in 3D:
> Value is z coordinate.
> The "sides" of the triangle are normalized to triangle coordinates by
> normalizing to the largest side (hypotenuse).
> Then compress/change the scales to make it look like an isosceles or
> equilateral, so it's not to scale.
> Or if that doesn't look interesting, swap the z value vector with
> either the x or y vector.
> On Thu, Aug 19, 2010 at 2:51 PM, Donald Alan Morrison
> <donmorrison at gmail.com> wrote:
>> On Thu, Aug 19, 2010 at 1:13 PM, Charles Greathouse
>> <charles.greathouse at case.edu> wrote:
>>> A019575 is:
>>> The formula, as listed, is confusing.  Can anyone determine a better
>>> (ideally, an efficient) formula or gf?  Also, a b-file might be nice,
>>> though at the moment there's no good way to visualize large triangular
>>> arrays.
>> Hi Charles,
>> Your visualization problem sounds interesting.  Do you have ideas
>> about what would be a proper visualization?
>> Cheers,
>> Don

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