I'm aware of the Hofstadter Male and Female sequences, which are a pair of integer sequences defined via mutual recursion:
$ M(0) = 0 $ $ F(0) = 1 $
$ M(n) = n - M(F(n-1)) $ $ F(n) = n - F(M(n-1)) $
Are there any known examples of three or more integer sequences defined in similar mannner (via indirect recursion)?