login
A131173
Signature permutation of a self-inverse Catalan automorphism: row 7 of A122285 and A122286.
5
0, 1, 2, 3, 4, 5, 6, 8, 7, 9, 10, 11, 12, 13, 14, 15, 19, 21, 22, 16, 20, 17, 18, 23, 24, 25, 27, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 51, 52, 56, 58, 59, 60, 62, 63, 64, 42, 43, 53, 57, 61, 44, 54, 45, 46, 47, 55, 48, 49, 50, 65, 66, 67, 68, 69, 70, 71
OFFSET
0,3
COMMENTS
Derived from automorphism *A122282 with recursion scheme SPINE or ENIPS.
PROG
(Destructive Scheme implementation of this automorphism, which acts on S-expressions, i.e. list-structures:)
(define (*A131173! s) (cond ((pair? s) (*A069770! (car s)) (if (pair? (cdr s)) (*A131173! (cddr s))))) s)
CROSSREFS
Sequence in context: A089854 A154453 A154454 * A073286 A122312 A130985
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 20 2007
STATUS
approved