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A058519
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Number of directed cycles of B-trees of order 3 with n labeled leaves.
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2
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0, 1, 2, 3, 5, 8, 15, 24, 46, 82, 157, 293, 576, 1095, 2138, 4156, 8162, 16019, 31675, 62608, 124341, 247224, 493067, 984905, 1971970, 3953749, 7941397, 15971775, 32168510, 64866564, 130959749, 264676274, 535488128, 1084424916
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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MAPLE
| spec := [C, {B=Union(Z, Subst(M, B)), M=Union(Prod(Z, Z), Prod(Z, Z, Z)), C=Cycle(B)}]; [seq(combstruct[count](spec, size=n), n=0..40)];
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CROSSREFS
| Cf. A058518, A014535.
Sequence in context: A152478 A102973 A066372 * A181065 A191792 A151518
Adjacent sequences: A058516 A058517 A058518 * A058520 A058521 A058522
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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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