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A052836
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A simple grammar.
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0
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0, 1, 2, 5, 16, 54, 197, 746, 2916, 11650, 47418, 195794, 818347, 3455173, 14715502, 63143438, 272721871, 1184697735, 5172610484, 22687623448, 99918182347
(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 803
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MAPLE
| spec := [S, {B=Prod(Z, C), S=Sequence(B, 1 <= card), C= PowerSet(S)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A149966 A149967 A148400 * A108526 A149968 A149969
Adjacent sequences: A052833 A052834 A052835 * A052837 A052838 A052839
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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