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A080971
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A014486-encodings of the trees whose interior zigzag-tree (Stanley's c) is not branch-reduced (in the sense defined by Donaghey).
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4
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42, 56, 170, 172, 184, 202, 212, 226, 232, 240, 682, 684, 690, 692, 696, 714, 724, 738, 744, 752, 810, 812, 824, 842, 850, 852, 856, 880, 906, 908, 916, 930, 936, 944, 962, 964, 968, 976, 992, 2730, 2732, 2738, 2740, 2744, 2762, 2764, 2770, 2772, 2776, 2786
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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REFERENCES
| R. Donaghey, Automorphisms on Catalan trees and bracketing, J. Combin. Theory, Series B, 29 (1980), 75-90.
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LINKS
| A. Karttunen, Initial terms illustrated in positions 4, 8, 9, 10, 13, 14, 17, 19, 21, 22, 23, 24, 25, 26, 27, 28, 31, ...
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CROSSREFS
| a(n) = A014486(A080970(n)). Cf. A080981.
Sequence in context: A043916 A124656 A002706 * A039384 A043207 A043987
Adjacent sequences: A080968 A080969 A080970 * A080972 A080973 A080974
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KEYWORD
| nonn
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AUTHOR
| Antti Karttunen (my_firstname.my_surname(AT)iki.fi) Mar 02 2003
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