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 A290344 Denominators of the Kirchhoff (and Harary) index for the n-hypercube graph. 1
 1, 1, 1, 3, 3, 15, 15, 105, 105, 315, 63, 693, 693, 9009, 9009, 45045, 45045, 765765, 765765, 14549535, 14549535, 14549535, 14549535, 334639305, 334639305, 1673196525, 1673196525, 5019589575, 5019589575, 145568097675, 145568097675, 4512611027925, 4512611027925 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Eric Weisstein's World of Mathematics, Harary Index Eric Weisstein's World of Mathematics, Hypercube Graph Eric Weisstein's World of Mathematics, Kirchhoff Index EXAMPLE Kirchhoff (and Harary) indices are 0, 1, 5, 58/3, 206/3, 3548/15, 12136/15, 291824/105, 1012048/105, .... MATHEMATICA Table[-2^(n - 1) HarmonicNumber[n] - 4^n Re[LerchPhi[2, 1, n + 1]], {n, 0, 32}] // Denominator Table[2^(-1 + n) n HypergeometricPFQ[{1, 1, 1 - n}, {2, 2}, -1], {n, 0, 32}] // Denominator (* Eric W. Weisstein, Dec 11 2017 *) CROSSREFS Cf. A290343 (numerators). Sequence in context: A086116 A100735 A129356 * A217858 A185275 A055634 Adjacent sequences:  A290341 A290342 A290343 * A290345 A290346 A290347 KEYWORD nonn,frac AUTHOR Eric W. Weisstein, Jul 28 2017 STATUS approved

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Last modified April 23 12:15 EDT 2021. Contains 343204 sequences. (Running on oeis4.)