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A192791
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Molecular topological index of the n-antiprism graph.
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1
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40, 112, 240, 448, 760, 1200, 1792, 2560, 3528, 4720, 6160, 7872, 9880, 12208, 14880, 17920, 21352, 25200, 29488, 34240, 39480, 45232, 51520, 58368, 65800, 73840, 82512, 91840, 101848, 112560, 124000, 136192, 149160, 162928, 177520, 192960, 209272, 226480, 244608, 263680
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OFFSET
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1,1
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COMMENTS
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Antiprism graphs are defined for n>=3; sequence extended to n=1 using closed form
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LINKS
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FORMULA
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a(n) = 4*n*(n^2 + n + 8).
a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4).
G.f.: 8*x*(4*x^2-6*x+5)/(x-1)^4. - Colin Barker, Nov 04 2012
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MATHEMATICA
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LinearRecurrence[{4, -6, 4, -1}, {40, 112, 240, 448}, 40] (* Harvey P. Dale, Mar 29 2018 *)
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PROG
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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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EXTENSIONS
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STATUS
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approved
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