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Search: id:A052890
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| 1, 1, 2, 6, 16, 49, 153, 493, 1623, 5460, 18625, 64373, 224843, 792546, 2815443, 10070115, 36233440, 131063713, 476320360, 1738401482, 6368750019
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 866
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MAPLE
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spec := [S, {B=Set(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
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Sequence in context: A151528 A132803 A079565 this_sequence A052814 A151445 A000136
Adjacent sequences: A052887 A052888 A052889 this_sequence A052891 A052892 A052893
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KEYWORD
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easy,nonn
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AUTHOR
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encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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Search completed in 0.002 seconds
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