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A052843
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A simple grammar.
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0
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1, 1, 2, 3, 6, 10, 20, 38, 79, 162, 348, 751, 1661, 3695, 8335, 18919, 43310, 99664, 230700, 536327, 1252298
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 811
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MAPLE
| spec := [S, {C=Prod(Z, B), B=PowerSet(C), S=Set(C)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A003214 A123423 A005195 * A120707 A047111 A106741
Adjacent sequences: A052840 A052841 A052842 * A052844 A052845 A052846
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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