Tribonacci(first, second, third, number)

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