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A058521
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B-trees of order 5 with n labeled leaves.
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2
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1, 1, 1, 2, 3, 4, 7, 11, 20, 36, 67, 121, 215, 377, 657, 1154, 2045, 3666, 6628, 12063, 22079, 40642, 75264, 140191, 262457, 493297, 929703, 1754941, 3314509, 6258052, 11803995, 22232306, 41801393, 78453563, 146987053, 274957984
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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LINKS
| Index entries for sequences related to rooted trees
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MAPLE
| spec := [ B, {B=Union(Z, Subst(M, B)), M=Union(Prod(Z, Z), Prod(Z, Z, Z), Prod(Z$4), Prod(Z$5))} ]: [seq(combstruct[count](spec, size=n), n=1..40)];
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CROSSREFS
| Cf. A014535, A037026.
Sequence in context: A018064 A188624 A107481 * A116628 A140463 A073147
Adjacent sequences: A058518 A058519 A058520 * A058522 A058523 A058524
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 21 2000
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