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+#!/usr/bin/env python3
+
+# Challenge 153
+#
+# TASK #1 > Left Factorials
+# Submitted by: Mohammad S Anwar
+# Write a script to compute Left Factorials of 1 to 10. Please refer
+# OEIS A003422 for more information.
+#
+# Expected Output:
+# 1, 2, 4, 10, 34, 154, 874, 5914, 46234, 409114
+
+def fact(n):
+    if n < 2:
+        return 1
+    else:
+        return n * fact(n-1)
+
+def left_fact(n):
+    sum = 0
+    for k in range(n):
+        sum += fact(k)
+    return sum
+
+out = [left_fact(x) for x in range(1, 10+1)]
+print(", ".join(map(str, out)))