gistfile1.ml

let rec nums = seq { yield 1
                     for n in nums do yield n+1 }


How does this work? 

When we call 'nums' on line 2 it recurses to the function again which means that on the first recursion the only value 
in 'nums' is 1? So then we add the value 2 into the sequence presumably. Which means that if we recurse again then 1 
and 2 will both be in the sequence. Not convinced I understand this very well...