# Thread: Question regarding Stirling Numbers!!!!!!!

1. ## Question regarding Stirling Numbers!!!!!!!

Hi I'm having some problems with the following question!!

Show S2n,2 = 2n + (2n 2) + (2n 3) + ..... + (2n n-1) + 1/2(2n n)

[Note that (2n 2), (2n 3) etc are the notation for the binomial coefficients]

I'm having trouble understanding how to expand a stirling number. I know the general forumla but if anyone knows how to make it look like the one above that would be great!

Thanks

2. Originally Posted by luke.reader
Hi I'm having some problems with the following question!!

Show S2n,2 = 2n + (2n 2) + (2n 3) + ..... + (2n n-1) + 1/2(2n n)

[Note that (2n 2), (2n 3) etc are the notation for the binomial coefficients]

I'm having trouble understanding how to expand a stirling number. I know the general forumla but if anyone knows how to make it look like the one above that would be great!

Thanks
You might find this site helpful.

-Dan

3. Thanks for replying so quickly Dan... I've looked on there and my efforts do not seem to generate what I need. Any chance somebody could show me a worked example for something similar??