id:A123498 - OEIS Search Results

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Signature permutation of a nonrecursive Catalan automorphism: row 1654249 of table A089840.

+0
5

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

	OFFSET	`0,3`
	LINKS	`A. Karttunen, Prolog-program which illustrates the construction of this and other similar nonrecursive Catalan automorphisms.` `Index entries for signature-permutations of Catalan automorphisms`
	PROGRAM	`(Scheme function, destructive implementation of this automorphism acting on S-expressions:) (define (A123498! s) (cond ((null? s) s) ((and (pair? (cdr s)) (pair? (cadr s))) (let ((old-cddr-s (cddr s))) (set-cdr! (cdr s) (cdadr s)) (set-cdr! (cadr s) old-cddr-s)) (A074679! s)) ((pair? (cdr s)) (A072796! s)) ((pair? (car s)) (A072797! s))) s)`
	CROSSREFS	`Inverse: A123497. Row 1654249 of A089840. Used to construct automorphism *A123502. A074679(n) = A083927(a(A057123(n))).` `Sequence in context: A021430 A138676 A035532 this_sequence A123502 A073209 A073197` `Adjacent sequences: A123495 A123496 A123497 this_sequence A123499 A123500 A123501`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen (His-Firstname.His-Surname(AT)gmail.com), Oct 11 2006`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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