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A000527
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Series-parallel numbers.
(Formerly M5304 N2306)
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1
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52, 472, 3224, 18888, 101340, 511120, 2465904, 11496144, 52165892, 231557064, 1009247192, 4331502840, 18346242492, 76822836544, 318485778848, 1308750158016, 5335993098340, 21603437175288, 86912657626392, 347660876627944, 1383457374046444, 5479086968052912, 21604984733546336, 84850331177724944, 332001521469767940, 1294589169323791912, 5031934808360234760, 19500424806065865400, 75360646947991208396, 290478417300879735680, 1116919455364101145920, 4284817000807140094464, 16402243457215852326116, 62659647762404302956856, 238910441445219175239480
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,1
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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.: 4(13+14S+3S^2)(1+S)/(1-S)^7, where S = g.f. for A000084
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CROSSREFS
| Sequence in context: A079414 A005946 A200549 * A100413 A160344 A163691
Adjacent sequences: A000524 A000525 A000526 * A000528 A000529 A000530
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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 and g.f. from Sean A. Irvine (sairvin(AT)xtra.co.nz), Nov 14 2010
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