diff --git a/src/aoc2024/Day11.kt b/src/aoc2024/Day11.kt
index 683614b..ac422b1 100644
--- a/src/aoc2024/Day11.kt
+++ b/src/aoc2024/Day11.kt
@@ -24,26 +24,22 @@ fun main() {
         return -1
     }
 
-    fun rec(n: Long, i: Int): Long {
-        //println("$i $n")
-        if (i == 0) return 1
-        val ll = lookupTable[n to i]
-        if (ll != null) return ll
-        val result = if (n == 0L) {
-            rec(1L, i - 1)
-        } else {
-            val size = fastCeilLog10(n)
-            if (size and 1 == 0) {
-                val left = n / powTenTable[size / 2]
-                val right = n % powTenTable[size / 2]
-                rec(left, i - 1) + rec(right, i - 1)
+    fun rec(n: Long, i: Int): Long =
+        if (i == 0) 1 else lookupTable.getOrPut(n to i) {
+            if (n == 0L) {
+                rec(1L, i - 1)
             } else {
-                rec(n * 2024L, i - 1)
+                val size = fastCeilLog10(n)
+                if (size and 1 == 0) {
+                    val left = n / powTenTable[size / 2]
+                    val right = n % powTenTable[size / 2]
+                    rec(left, i - 1) + rec(right, i - 1)
+                } else {
+                    rec(n * 2024L, i - 1)
+                }
             }
         }
-        lookupTable[n to i] = result
-        return result
-    }
+
 
     fun part1(input: List<String>): Long {
         val numbers = input[0].splitLongs()