duplicate hunting, pt. 11

[Joshua Zucker]

> A053191 and A115135 (IMO, interesting possible duplicate)
> http://www.research.att.com/~njas/sequences/?q=id:A053191|id:A115135

The formulas are identical, and neither formula is too hard to prove;
yes, they are indeed duplicates.

> A091928 and A122694
> http://www.research.att.com/~njas/sequences/?q=id:A091928|id:A122694

Yup, the same.  An easy generating function problem to prove that they
are the same.

Some of the other ones look like they should be easy to prove but I
don't quite see it yet ...

--Joshua