0,3

This self-inverse automorphism is obtained as either SPINE(*A129608) or ENIPS(*A129608). See the definitions given in A122203 and A122204.

A. Karttunen, Table of n, a(n) for n = 0..2055

Index entries for signature-permutations of Catalan automorphisms

(Destructive Scheme implementation of this automorphism, which acts on S-expressions, i.e. list-structures:)

(define (*A130339! s) (if (even? (length s)) (*A129608! s)) s)

Cf. a(n) = A057508(A130340(A057508(n))) = A057164(A130340(A057164(n))). Row 3608 of A122285 and A122286. a(n) = A129608(n), if A057515(n) mod 2 = 0, otherwise a(n)=n.

Sequence in context: A275582 A129607 A130340 * A058812 A320454 A320455

Adjacent sequences: A130336 A130337 A130338 * A130340 A130341 A130342

nonn

Antti Karttunen, Jun 05 2007

approved