login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A058519 Number of directed cycles of B-trees of order 3 with n labeled leaves. 1
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; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..33.

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)];

CROSSREFS

Cf. A058518, A014535.

Sequence in context: A152478 A102973 A066372 * A181065 A282239 A191792

Adjacent sequences:  A058516 A058517 A058518 * A058520 A058521 A058522

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 21 2000

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 18 18:52 EDT 2019. Contains 324215 sequences. (Running on oeis4.)