ENIPS-transformation is explained in A122204. This automorphism permutes the top-level of a list of even length (1 ... 2n) as (2 4 6 ... 2n-2 2n 2n-1 2n-3 ... 5 3 1) and when applied to a list of odd length (1 .. 2n+1), permutes it as (2 4 6 ... 2n-2 2n 2n+1 2n-1 2n-3 ... 5 3 1). Used to construct A127288.