A052523 Number of unlabeled mobiles with cycles of length at least 3.

0, 1, 0, 1, 1, 2, 3, 6, 12, 25, 53, 114, 257, 567, 1294, 2944, 6790, 15693, 36598, 85578, 201299, 474975, 1125349, 2674160, 6374879, 15236478, 36510886, 87688909, 211061972, 509015536, 1229874162, 2976713669, 7216333477, 17520731199, 42599632645, 103714603196

Offset

0,6

Links

Robert Israel, Table of n, a(n) for n = 0..2234

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 91

Maple

spec := [S, {S=Union(B, Z), B=Cycle(S, 3 <= card)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);

Crossrefs

Sequence in context: A032235 A192805 A162985 * A262430 A204855 A259098

Adjacent sequences: A052520 A052521 A052522 * A052524 A052525 A052526

Keyword

easy,nonn

Author

encyclopedia(AT)pommard.inria.fr, Jan 25 2000

Extensions

Terms a(21) and beyond from b-file by Andrew Howroyd, Feb 05 2018

Status

approved