Fibonacci Number Calculator
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Fibonacci sequence
By definition, the first two numbers in the Fibonacci sequence are either 1 and 1, or 0 and 1, depending on the chosen starting point of the sequence, and each subsequent number is the sum of the previous two. In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence, and characterized by the fact that every number after the first two is the sum of the two preceding ones.
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Like 0 , 1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 , 89 , 144. The Fibonacci spiral: an approximation of the golden spiral created by drawing circular arcs connecting the opposite corners of squares in the Fibonacci tiling this one uses squares of sizes 1, 1, 2, 3, 5, 8, 13 and 21.

1202
Named after Fibonacci, (Leonardo of Pisa or Leonardo Pisano).
Fibonacci numbers were first introduced in his Liber abaci in 1202.
Fibonacci was the son of a Pisan merchant and he traveled widely and traded extensively. Math was incredibly important to those in the trading industry, and his passion for numbers was cultivated in his youth. 
Fibonacci spiral
Fibonacci numbers do appear in nature, from sunflowers to hurricanes to galaxies. Sunflowers seeds, for example, are arranged in a Fibonacci spiral, keeping the seeds uniformly distributed no matter how large the seed head may be.