September Morn Update

Task/Fibonacci-sequence/Lua/fibonacci-sequence-5.lua

@@ -0,0 +1,9 @@
+-- table recursive done properly (values are actually saved into table;
+-- also the first element of Fibonacci sequence is 0, so the initial table should be {0, 1}).
+fib_n = setmetatable({0, 1}, {
+  __index = function(t,n)
+    if n <= 0 then return 0 end
+    t[n] = t[n-1] + t[n-2]
+    return t[n]
+  end
+})