The Fibonacci sequence is generated by starting with the numbers 0 and 1 (or 1 and 1) and obtaining the next number by adding them together. All successive numbers are the sum of the previous two.
0 + 1 = 1
1 + 1 = 2
1 + 2 = 3
2 + 3 = 5
and so on.
For this sequence, we have
1 + 6 = 7
6 + 7 = 13
7 + 13 = 20
13 + 20 = 33
20 + 33 = 53
33 + 53 = 86
