0,3

a(a(n)) = n: a self-inverse permutation of the natural numbers. a(x) = x iff x = A065654(k) for some k.

Table of n, a(n) for n=0..63.

Index entries for sequences that are permutations of the natural numbers

a(A065653(k) + j) = A065653(k+1) - 1 - j for k >= 0 and 0 <= j < A065653(k+1) - A065653(k).

Cf. A065653, A065654

Sequence in context: A309734 A309668 A238758 * A235200 A267099 A266416

Adjacent sequences: A065649 A065650 A065651 * A065653 A065654 A065655

nonn

Reinhard Zumkeller, Nov 10 2001

approved