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 A221016 The Wiener index of the fullerenyl anion G[n]C[60], defined pictorially in the Arezoomand reference (see Fig. 5). 2
 12428, 25756, 73468, 261436, 1085628, 4928956, 23182268, 109461436, 511850428, 2360346556, 10732660668, 48186107836, 213969872828, 941234202556, 4107353204668, 17801256904636, 76697127888828, 328767094400956, 1403004540430268, 5963809411835836, 25262501717354428 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS See Table on p. 722 of the Arezoomand reference. LINKS G. C. Greubel, Table of n, a(n) for n = 0..1000 M. Arezoomand, On the distance-based topological indices of fullerene and fullerenyl anions having dendrimer units, Digest J. of Nanomaterials and Biostructures, 4 (2009) 713-722. Index entries for linear recurrences with constant coefficients, signature (13,-64,148,-160,64) FORMULA a(n) = 10172 + 2^n*(5600*n + 4880) + 4^n*(1280*n - 2624). G.f.: 4*(3107 - 33952*x + 133508*x^2 - 221152*x^3 + 141376*x^4)/((1-x)*(1-2*x)^2*(1-4*x)^2). - Bruno Berselli, Dec 30 2012 MAPLE a := proc (n) options operator, arrow: 10172+2^n*(5600*n+4880)+4^n*(1280*n-2624) end proc: seq(a(n), n = 0 .. 20); MATHEMATICA Table[10172 + 2^n*(5600*n+4880) +4^n*(1280*n-2624), {n, 0, 20}] (* G. C. Greubel, Nov 06 2018 *) PROG (PARI) a(n) = 10172 + 2^n*(5600*n+4880) + 4^n*(1280*n-2624); \\ Andrew Howroyd, Nov 05 2018 (Magma) [10172 + 2^n*(5600*n+4880) +4^n*(1280*n-2624): n in [0..20]]; // G. C. Greubel, Nov 06 2018 CROSSREFS Cf. A221017. Sequence in context: A156116 A068676 A252613 * A237901 A234127 A272132 Adjacent sequences: A221013 A221014 A221015 * A221017 A221018 A221019 KEYWORD nonn,easy AUTHOR Emeric Deutsch, Dec 30 2012 STATUS approved

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Last modified February 3 01:24 EST 2023. Contains 360024 sequences. (Running on oeis4.)