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A052831 A simple grammar. 0
0, 1, 2, 4, 11, 29, 91, 286, 955, 3235, 11240, 39559, 141217, 509059, 1852248, 6790372, 25062536, 93043286, 347223013, 1301777476, 4900835727 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..20.

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 796

MAPLE

spec := [S, {B=Prod(C, Z), C=PowerSet(S), S=Cycle(B)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);

CROSSREFS

Sequence in context: A148145 A052869 A316768 * A148146 A148147 A298269

Adjacent sequences:  A052828 A052829 A052830 * A052832 A052833 A052834

KEYWORD

easy,nonn,uned

AUTHOR

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

STATUS

approved

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Last modified August 6 19:52 EDT 2020. Contains 336256 sequences. (Running on oeis4.)