Sequence: total number of vertices in all n-dimensional regular polytopes

[franktaw at netscape.net]

Nice sequence.

One minor quibble: I would make it 0 if the number is infinite, not -1. 

The -1 would be appropriate if you didn't know whether there were
any 0's in the sequence, but in this case I think 0 is better.

Franklin T. Adams-Watters

-----Original Message-----
From: Jonathan Post <jvospost3 at gmail.com>

Total number of vertices in all n-dimensional regular polytopes, or -1
if the number is infinite.

n  a(n)
0   1
1   2
2   -1
3   50
...