According to the link, zero is the first number in the series.
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1, 1 and 2
A Fibonacci number, Fibonacci sequence or Fibonacci series are a mathematical term which follow a integer sequence. The first two numbers in Fibonacci sequence start with a 0 and 1 and each subsequent number is the sum of the previous two.
Start with 1 and 2. Then each number in the Fibonacci sequence is the sum of the previous two numbers in the sequence.
1, 1 are the first two numbers in the sequence; so, that's where you begin. In the Fibonacci sequence, you add numbers. Each sum is added to the previous largest number, to make the next number in the sequence. So, adding the first two numbers; 1 + 1 = 2. Then, as 2 was the resulting sum; and one was the last largest number, you add them. 1 + 2 = 3. And so on... The first ten numbers in the sequence are; 1, 1, 2, 3, 5, 8, 13, 21, 34, 55. It continues like this, indefinitely.
The first number, f1 = 1 The second number, f2 = 1 After that the sequence is defined recursively: fn = fn-1 + fn-2 for n=3, 4, 5, ...