How to represent this sequence mathematically? I need to represent the sequence of pairs $$(N,0), (N-1,1), (N-2,2), \ldots , \left( \frac{N}{2}, \frac{N}{2}\right) $$
in a way I can use in a formula. Is there any way to do this? Thanks!

What about
$$(N-i,i),\quad i\in\{0,1,\ldots N/2\}$$
(assuming $N$ is even)?
