Tribonacci Series

1# Take n
2n = int(input("Enter number of terms: "))
3
4# Generate Tribonacci
5if n <= 0:
6    print("Invalid input")
7elif n == 1:
8    print("0")
9elif n == 2:
10    print("0 1")
11elif n == 3:
12    print("0 1 1")
13else:
14    a, b, c = 0, 1, 1
15    print(a, b, c, end=" ")
16    for i in range(3, n):
17        d = a + b + c
18        print(d, end=" ")
19        a, b, c = b, c, d
20    print()