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A058518
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Number of forests of B-trees of order 3 with n labeled leaves.
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3
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1, 1, 1, 2, 2, 4, 6, 9, 14, 21, 33, 54, 89, 142, 222, 350, 554, 883, 1406, 2225, 3511, 5539, 8768, 13977, 22417, 36143, 58483, 94818, 153716, 248699, 401054, 644485, 1032794, 1652377, 2642421, 4227547, 6769660, 10851491, 17410292, 27951747
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OFFSET
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0,4
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LINKS
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Table of n, a(n) for n=0..39.
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MAPLE
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spec := [C, {B=Union(Z, Subst(M, B)), M=Union(Prod(Z, Z), Prod(Z, Z, Z)), C=PowerSet(B)} ]; [seq(combstruct[count](spec, size=n), n=0..40)];
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CROSSREFS
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Cf. A014535.
Sequence in context: A209603 A192684 A047084 * A018139 A025049 A052012
Adjacent sequences: A058515 A058516 A058517 * A058519 A058520 A058521
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Dec 21 2000
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STATUS
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approved
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