Add collatz sequence

math/collatz.py

@@ -0,0 +1,20 @@
+"""Collatz sequence.
+
+@author: Pablo Trinidad <github.com/pablotrinidad>
+"""
+
+
+def collatz(n):
+    """Sequence generation."""
+    l = []
+    while n > 1:
+        l.append(n)
+        if n % 2 == 0:
+            n = n / 2
+        else:
+            n = (3 * n) + 1
+    l.append(n)
+    return l
+
+n = int(input("Enter an integer n to compute the Collatz sequence: "))
+print(collatz(n))