The Fibonacci sequence requires two numbers as "seeds".
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The 20th Fibonacci number in the sequence is 6,765.
42
The Fibonacci sequence starts with 1 and 1. However any sequence in which the first two terms are given and the rest are defined recursively as t(n) = t(n-2) + t(n-1), with n = 3, 4, ... is also known as a Fibonacci sequence. Note the "the" and "a" preceding Fibonacci sequence.
No, the Fibonacci sequence never ends. It just keeps on going!
Assuming the Fibonacci sequence starts with the numbers 0, 1, as per sequence A000045, the 24th Fibonacci number is 28657.