0,3

Automorphism *A089863 = SPINE(*A129612). See the definition given in A122203.

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

A. Karttunen, Prolog-program which illustrates the construction of this and similar nonrecursive Catalan automorphisms.

Index entries for signature-permutations of Catalan automorphisms

(Constructive and destructive Scheme implementation of this automorphism. These act on S-expressions, i.e. list-structures:)

(define (*A129612 s) (cond ((pair? s) (let ((t (*A089863 s))) (cons (car t) (*A089859 (cdr t))))) (else s)))

(define (*A129612! s) (cond ((pair? s) (*A089863! s) (*A089859! (cdr s)))) s)

Inverse: A129611. Differs from A082345 for the first time at n=49, where A082345(49)=27, while a(49)=26.

Sequence in context: A130928 A154126 A069770 * A154455 A082345 A122327

Adjacent sequences: A129609 A129610 A129611 * A129613 A129614 A129615

nonn

Antti Karttunen, May 22 2007

approved