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1, 1, 1, 2, 2, 4, 4, 11, 15, 25, 32, 64, 88, 155, 234, 423, 647, 1184, 1800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| This is the number of nonzero, non-constant terms of the polynomials M_n(x) Donaghey gives on the page 81 of his paper. The term x^18 seems to have been accidentally dropped from the polynomial M_7(x).
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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
| Counted with the help of this C-program
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CROSSREFS
| Cf. A081166, A060114.
Sequence in context: A133406 A005293 A057784 * A125553 A138317 A103659
Adjacent sequences: A081161 A081162 A081163 * A081165 A081166 A081167
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KEYWORD
| nonn
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AUTHOR
| Wouter Meeussen (wouter.meeussen(AT)pandora.be) & Antti Karttunen (Firstname.Surname(AT)iki.fi) Mar 10 2003
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