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How can I make a Tribonacci sequence in the form of a list?

How can I make a Tribonacci sequence that is in listing form? it suppose to look like the Fibonacci sequence but I couldn't get the same result with Tribonacci.enter image description here

Array[Fibonacci, 9]
{1, 1, 2, 3, 5, 8, 13, 21, 34}
Array[Tribonacci, 9]
{Tribonacci[1], Tribonacci[2], Tribonacci[3], Tribonacci[4], 
 Tribonacci[5], Tribonacci[6], Tribonacci[7], Tribonacci[8], Tribonacci[9]}