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Search: id:A052815
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A052815 A simple grammar. +0
1
0, 1, 2, 5, 16, 56, 221, 900, 3839, 16752, 74701, 338327, 1553181, 7208191, 33768389, 159463655, 758291989, 3627890869, 17450572584, 84342086908, 409394388458 (list; graph; listen)
OFFSET

0,3

LINKS

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 780

MAPLE

spec := [S, {B=Prod(C, Z), C=Sequence(S), S=Cycle(B)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);

CROSSREFS

Sequence in context: A149977 A147771 A052891 this_sequence A082789 A072110 A114296

Adjacent sequences: A052812 A052813 A052814 this_sequence A052816 A052817 A052818

KEYWORD

easy,nonn

AUTHOR

encyclopedia(AT)pommard.inria.fr, Jan 25 2000

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.


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