added fibonacci

contributor_database

@@ -28,3 +28,4 @@ has_duplicates: [Rob-Rychs](@Rob-Rychs)
 keys_only: [Rob-Rychs](@Rob-Rychs)
 values_only: [Rob-Rychs](@Rob-Rychs)
 all_unique: [Rob-Rychs](@Rob-Rychs)
+fibonnaci_until_num: [Nian Lee](@scraggard)

snippets/fibonacci_until_num.md

@@ -0,0 +1,18 @@
+### fibonacci_until_num
+
+Returns the n-th term in a Fibonnaci sequence that starts with 1
+
+A term in a Fibonnaci sequence is the sum of the two previous terms.
+This function recursively calls the function to find the n-th term.
+
+``` python
+def fibonacci_until_num(n):
+  if n < 3:
+    return 1
+  return fibonacci_until_num(n - 2) + fibonacci_until_num(n - 1)
+```
+
+``` python
+fibonnaci_until_num(5) # 5
+fibonnaci_until_num(15) # 610
+```