I was just playing around with Wolfram Alpha and n-th derivatives of functions, and I found this....n-th derivative of W(x) equation
As you can see, there are some weird functions. I found most of them in the bottom-right corner. However, that Y function isn't anywhere. I typed in that, and it returned nothing. My phone is really laggy so I couldn't see how Mathematica interprets it. Does anybody know the name of that function?