Tribonacci(first, second, third, number) 
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Generates number scores in a Tribonacci sequence starting with first, second and third.
Example: Tribonacci(1,1,1,20)
Note: If you type decimals using a comma (eg 3,2) you should enter this formula as Tribonacci(1; 1; 1; 20)  using the ; as a separator
