What is the Fibonacci Series formula? June 27, 2024April 1, 2021 by Sunil Chaudhary Guruji What is the Fibonacci Series formula? Fn = Fn–1 + Fn–2. to get the rest. Thus the sequence begins 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, … This sequence of Fibonacci numbers arises all over mathematics and also in nature.