Is there a formula for the Tribonacci sequence, where the formula for Fibonacci is:
$$F_n=\frac{(1+\sqrt 5)^n-(1-\sqrt 5)^n)}{2^n\sqrt 5}.$$
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A formula is given in Wikipedia and various forms in OEIS – Ross Millikan Jan 16 '19 at 18:45
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3Possible duplicate of How to find the nth term of tribonacci series Also see this question – Ross Millikan Jan 16 '19 at 18:48