C# Daily Programmer Ex.180 Look ‘n’ Say Sequence Using Nested Loops and List

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Description
The Look and Say sequence is an interesting sequence of numbers where each term is given by describing the makeup of the previous term.
The 1st term is given as 1. The 2nd term is 11 (‘one one’) because the first term (1) consisted of a single 1. The 3rd term is then 21 (‘two one’) because the second term consisted of two 1s. The first 6 terms are:
1
11
21
1211
111221
312211
Formal Inputs & Outputs
Input
On console input you should enter a number N
Output
The Nth Look and Say number.
Bonus
Allow any ‘seed’ number, not just 1. Can you find any interesting cases?

Original exercise and other solutions:
http://www.reddit.com/r/dailyprogrammer/comments/2ggy30/9152014_challenge180_easy_looknsay/

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