Fibonacci is the name of an Italian mathematician who in the year 1202 introduced a very special number sequence in Europe that had been known in India for centuries.
The rule of this sequence is so simple that even children can understand or even 'invent' it. Starting with 0 and 1, each next number is the sum of the previous two: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144 ... and so on to infinity.