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A052879
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A simple grammar.
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0
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1, 1, 2, 7, 22, 81, 303, 1178, 4675, 18951, 77925, 324642, 1366718, 5806575, 24861979, 107178994, 464805955, 2026418389, 8876266930, 39045009419, 172406753611
(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 850
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MAPLE
| spec := [S, {B=Sequence(C, 1 <= card), C=Prod(Z, S), S= PowerSet(B)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A047095 A110137 A097967 * A007867 A014558 A150322
Adjacent sequences: A052876 A052877 A052878 * A052880 A052881 A052882
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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