Question 1177677
<br>
TRIbonacci numbers -- like Fibonacci numbers except each term is the sum of the preceding THREE terms:
first three numbers 1, 2, 3;
each subsequent term is the sum of the preceding three terms<br>
1
2
3
1+2+3=6
2+3+6=11
3+6+11=20
6+11+20=37
11+20+37=68
...<br>
You can use the recursive definition to find as many terms as you want.<br>
I don't believe there is an explicit formula for the n-th term.<br>