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A052814
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A simple grammar.
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0
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0, 1, 1, 2, 6, 16, 49, 156, 511, 1723, 5942, 20817, 73938, 265611, 963225, 3521667, 12966696, 48037862, 178936340, 669748197, 2517688316
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 779
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MAPLE
| spec := [S, {B=PowerSet(C), S=Prod(B, Z), C=Cycle(S)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A132803 A079565 A052890 * A192401 A151445 A195645
Adjacent sequences: A052811 A052812 A052813 * A052815 A052816 A052817
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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