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A052893
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A simple grammar.
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0
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1, 1, 3, 10, 37, 144, 589, 2483, 10746, 47420, 212668, 966324, 4439540, 20587286, 96237484, 453012296, 2145478716, 10215922013, 48877938369, 234862013473, 1132902329028
(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 869
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MAPLE
| spec := [S, {C=Set(B, 1 <= card), B=Prod(Z, S), S=Sequence(C)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A151052 A151053 A151054 * A052818 A151055 A151056
Adjacent sequences: A052890 A052891 A052892 * A052894 A052895 A052896
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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