diff --git a/02. Algorithms/09. Dynamic Programming/008. Nth Tribonacci Number/code.js b/02. Algorithms/09. Dynamic Programming/008. Nth Tribonacci Number/code.js
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+/**
+ * Recursion | DP
+ * https://leetcode.com/problems/n-th-tribonacci-number
+ * 
+ * Time O(n) | Space O(n)
+ * @param {number} n
+ * @return {number}
+ */
+var tribonacci = function(n) {
+
+    const cache = new Map();
+    if(n === 1 || n === 2) return 1;
+    if(n === 0) return 0;
+    const dfs = (n) => {
+      
+      if(cache.has(n)) return cache.get(n);
+      if(n === 2 || n === 1) return 1;
+      if(n === 0) return 0;
+      
+      const result = dfs(n-3) + dfs(n-2) + dfs(n-1);
+      cache.set(n, result);
+      return result;     
+    }
+
+    return dfs(n);
+};