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Search: id:A057545
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| 1, 1, 2, 3, 6, 6, 24, 72, 144, 147, 588, 672, 2136, 10152, 11520, 29484, 117936, 270576, 656352, 2062368, 4040160
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OFFSET
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0,3
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COMMENT
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For the convenience of the range notation above, we define A014137(-1) and A014138(-1) as zero.
Equal to the degree of the polynomials M_n(x) Donaghey gives on the page 81 of his paper.
Factored terms: 1, 1, 2, 3, 2*3, 2*3, 2^3 * 3, 2^3 * 3^2, 2^4 * 3^2, 3 * 7^2, 2^2 * 3 * 7^2, 2^5 * 3 * 7, 2^3 * 3 * 89, 2^3 * 3^3 * 47, 2^8 * 3^2 * 5, 2^2 * 3^4 * 7 * 13, 2^4 * 3^4 * 7 * 13, 2^4 * 3^2 * 1879, 2^5 * 3^2 * 43 * 53, 2^5 * 3^3 * 7 * 11 * 31, 2^5 * 3 * 5 * 19 * 443
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REFERENCES
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R. Donaghey, Automorphisms on Catalan trees and bracketing, J. Combin. Theory, Series B, 29 (1980), 75-90.
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CROSSREFS
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Cf. A057507, A060114, A080967, A081165.
Occurs for first time in A073203 as row 2614.
Sequence in context: A056391 A056430 A089878 this_sequence A015628 A060692 A015698
Adjacent sequences: A057542 A057543 A057544 this_sequence A057546 A057547 A057548
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KEYWORD
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nonn,more
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AUTHOR
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Antti Karttunen Sep 07 2000
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