A058519 Number of directed cycles of B-trees of order 3 with n labeled leaves.

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

Offset: 0

Author

N. J. A. Sloane, Dec 21 2000

Keywords

• nonn

Crossrefs

Cf. A058518, A014535.

Programs

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)];