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Old 2010-02-16, 20:45   #1
davar55's Avatar
May 2004
New York City

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Default Help Find a Sequence?

I'm trying to find a certain sequence, so far without success.
I don't want to paste pingpong balls together, especially since
this obvious sequence must have already been computed or counted.
Help, please?

The sequence begins with 1,13,?,?,?
and gives the number of identical spheres in a most
tight packing around the previous smaller packing,
starting with one sphere.
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