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A221008
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The Wiener index of the nanostar dendrimer D_3[n] , defined pictorially in the Alikhani - Iranmanesh reference.
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1
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1026, 19458, 174762, 1170810, 6751386, 35653338, 177967962, 854830170, 3994246746, 18282889818, 82367580762, 366439242330, 1613682326106, 7046530103898, 30553522371162, 131684094835290, 564617195813466, 2409993639295578, 10246077161667162, 43408725425257050, 183332581536692826
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = -1446 + 2^n*12132+4^n*(8820*n-9660).
G.f.: 18*(57+454*x+212*x^2)/((1-x)*(1-2*x)*(1-4*x)^2). - Bruno Berselli, Dec 30 2012
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MAPLE
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a := proc (n) options operator, arrow: -1446+12132*2^n+4^n*(8820*n-9660) end proc: seq(a(n), n = 0 .. 20);
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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