0
votes
2answers
251 views

Enumeration Result [closed]

Hi I have a very soft question: What exactly is the definition of an enumeration result? Let say I want to enumerate some combinatorial structure and I came up with an equation for a generating ...
20
votes
1answer
727 views

A strange sum over bipartite graphs

While mucking around with some generating functions related to enumeration of regular bipartite graphs, I stumbled across the following cutie. I wonder if anyone has seen it before, and/or if anyone ...