Fibinacco series
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: [1] [2] {\displaystyle 1,\;1,\;2,\;3,\;5,\;8,\;13,\;21,\;34,\;55,\;89,\;144,\;\ldots } Often, especially in modern usage, the sequence is extended by one more initial term: {\displaystyle 0,\;1,\;1,\;2,\;3,\;5,\;8,\;13,\;21,\;34,\;55,\;89,\;144,\;\ldots } . [3] The Fibonacci spiral: an approximation of the golden spiral created by drawing circular arcs connecting the opposite corners of squares in the Fibonacci tiling; [4] this one uses squares of sizes 1, 1, 2, 3, 5, 8, 13 and 21. 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. The sequence F n ...