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A058520
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Sequences of B-trees of order 3 with n labeled leaves.
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1
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1, 1, 2, 4, 8, 17, 35, 73, 152, 316, 659, 1376, 2875, 6004, 12535, 26173, 54654, 114134, 238348, 497743, 1039432, 2170634, 4532949, 9466295, 19768943, 41284768, 86218046, 180056039, 376025957, 785286555, 1639979712, 3424906290
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listen;
history;
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..31.
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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=Sequence(B)}]; [seq(combstruct[count](spec, size=n), n=0..40)];
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CROSSREFS
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Cf. A058518, A058519, A014535.
Sequence in context: A026392 A018094 A001357 * A127680 A136750 A097107
Adjacent sequences: A058517 A058518 A058519 * A058521 A058522 A058523
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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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