Not memoization, but I like the Raku version: $ raku -e 'my @fib = 0,1,{$^a + $^b} ... *; @fib[0..40].say' (0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 61

Not memoization, but I like the Raku version: $ raku -e 'my @fib = 0,1,{$^a + $^b} ... *; @fib[0..40].say' (0 1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946 17711 28657 46368 75025 121393 196418 317811 514229 832040 1346269 2178309 3524578 5702887 9227465 14930352 24157817 39088169 63245986 102334155)