First 20 Fibonacci Numbers
F(0) = 0
F(1) = 1
F(2) = 1
F(3) = 2
F(4) = 3
F(5) = 5
F(6) = 8
F(7) = 13
F(8) = 21
F(9) = 34
F(10) = 55
F(11) = 89
F(12) = 144
F(13) = 233
F(14) = 377
F(15) = 610
F(16) = 987
F(17) = 1597
F(18) = 2584
F(19) = 4181
The Fibonacci sequence: Each number is the sum of the two preceding ones. F(0) = 0, F(1) = 1, F(n) = F(n-1) + F(n-2). The ratio of consecutive Fibonacci numbers approaches the Golden Ratio (1.618...).
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