A123501 - OEIS

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A123501

Signature permutation of a Catalan automorphism: apply *A123497 at the root, then recurse into the left subtree of the right hand side subtree of a binary tree.

0, 1, 2, 3, 4, 6, 7, 5, 8, 9, 10, 14, 16, 19, 17, 18, 12, 11, 13, 20, 15, 21, 22, 23, 24, 25, 26, 27, 37, 38, 42, 44, 47, 51, 53, 56, 60, 45, 46, 48, 49, 50, 31, 34, 30, 28, 29, 35, 33, 32, 36, 54, 55, 40, 39, 41, 57, 43, 58, 59, 61, 52, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71

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OFFSET

0,3

LINKS

Table of n, a(n) for n=0..71.

Index entries for signature-permutations of Catalan automorphisms

PROG

(Scheme function, destructive implementation of this automorphism acting on S-expressions:) (define (*A123501! s) (*A123497! s) (cond ((and (pair? s) (pair? (cdr s))) (*A123501! (cadr s)))) s)

CROSSREFS

Inverse: A123502. A057501(n) = A083927(a(A057123(n))) = A083927(A085159(A057123(n))).

Sequence in context: A143102 A013944 A123497 * A073210 A073196 A086430

Adjacent sequences: A123498 A123499 A123500 * A123502 A123503 A123504

KEYWORD

nonn

AUTHOR

Antti Karttunen, Oct 11 2006

STATUS

approved