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 A000527 Series-parallel numbers. (Formerly M5304 N2306) 0
 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; text; internal format)
 OFFSET 4,1 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). LINKS FORMULA G.f.: 4(13+14S+3S^2)(1+S)/(1-S)^7, where S = g.f. for A000084. - Sean A. Irvine, Nov 14 2010 MATHEMATICA n = 35; s = 1/(1 - x) + O[x]^(n + 1); Do[s = s/(1 - x^k)^Coefficient[s, x^k] + O[x]^(n + 1), {k, 2, n}] ; S = s - 1; CoefficientList[4 (13 + 14 S + 3 S^2) (1 + S)/(1 - S)^7 + O[x]^n, x] (* Jean-François Alcover, Feb 09 2016 *) CROSSREFS Sequence in context: A257940 A005946 A200549 * A294055 A285753 A100413 Adjacent sequences:  A000524 A000525 A000526 * A000528 A000529 A000530 KEYWORD nonn AUTHOR EXTENSIONS More terms from Sean A. Irvine, Nov 14 2010 STATUS approved

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Last modified June 30 19:43 EDT 2022. Contains 354945 sequences. (Running on oeis4.)