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A000163
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Series-parallel numbers.
(Formerly M1852 N0732)
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0
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2, 8, 34, 136, 538, 2080, 7970, 30224, 113874, 426520, 1590338, 5906640, 21866794, 80725280, 297292610, 1092539736, 4007553922, 14675748416, 53663197698, 195962433328, 714734393378, 2603994002280, 9477643739746, 34463730424720
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,1
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REFERENCES
| J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 142.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
| G.f.: 2*(1+S)/(1-S)^3, where S = g.f. for A000084. [From Sean A. Irvine (sairvin(AT)xtra.co.nz), Oct 14 2009]
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CROSSREFS
| Sequence in context: A026577 A204090 A111643 * A117616 A192402 A014445
Adjacent sequences: A000160 A000161 A000162 * A000164 A000165 A000166
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Sean A. Irvine (sairvin(AT)xtra.co.nz), Oct 14 2009
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