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A290348 Denominators of the Harary index for the n-halved cube graph. 1
1, 1, 1, 1, 1, 3, 3, 3, 1, 5, 5, 15, 15, 105, 105, 105, 105, 315, 315, 315, 315, 3465, 3465, 3465, 693, 9009, 3003, 3003, 3003, 5005, 5005, 5005, 5005, 85085, 17017, 153153, 153153, 2909907, 2909907, 14549535 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..40.

Eric Weisstein's World of Mathematics, Halved Cube Graph

Eric Weisstein's World of Mathematics, Hypercube Graph

EXAMPLE

First few terms are 0, 1, 6, 26, 100, 1096/3, 3920/3, 13936/3, 16544, 296256/5, ....

MATHEMATICA

Table[-2^(n - 1) HarmonicNumber[n] - 2^(2 n - 1) Re[LerchPhi[2, 1, n + 1]], {n, 20}] // Denominator

CROSSREFS

Cf. A290347 (numerators).

Sequence in context: A059289 A201277 A163644 * A014465 A226645 A243095

Adjacent sequences:  A290345 A290346 A290347 * A290349 A290350 A290351

KEYWORD

nonn,frac

AUTHOR

Eric W. Weisstein, Jul 28 2017

STATUS

approved

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Last modified April 6 18:48 EDT 2020. Contains 333286 sequences. (Running on oeis4.)