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A000163 Series-parallel numbers.
(Formerly M1852 N0732) 		+0
1
2, 8, 34, 136, 538, 2080, 7970, 30224, 113874 (list; graph; listen)
OFFSET

2,1
REFERENCES

J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 142.

CROSSREFS

Sequence in context: A005040 A026577 A111643 this_sequence A117616 A014445 A113440

Adjacent sequences: A000160 A000161 A000162 this_sequence A000164 A000165 A000166

KEYWORD

nonn

AUTHOR

njas

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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