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A037026
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B-trees of order 4 with n leaves.
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4
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0, 1, 1, 1, 2, 2, 4, 5, 9, 15, 28, 45, 73, 116, 199, 345, 601, 1021, 1738, 2987, 5244, 9321, 16720, 30103, 54345, 97996, 176011, 314045, 556577, 980852, 1722451, 3020214, 5298570, 9316456, 16440262, 29136489, 51860214, 92643425, 165934156
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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LINKS
| Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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))} ]: [ seq(combstruct[count](spec, size=n), n=0..42) ];
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CROSSREFS
| Cf. A014535.
Sequence in context: A007147 A127968 A188541 * A116651 A135586 A168542
Adjacent sequences: A037023 A037024 A037025 * A037027 A037028 A037029
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Paul.Zimmermann(AT)loria.fr
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