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A182465
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a(n) = 3a(n-1) - 2a(n-2) with a(0)=28 and a(1)=70.
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6
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28, 70, 154, 322, 658, 1330, 2674, 5362, 10738, 21490, 42994, 86002, 172018, 344050, 688114, 1376242, 2752498, 5505010, 11010034, 22020082, 44040178, 88080370, 176160754, 352321522, 704643058, 1409286130, 2818572274, 5637144562, 11274289138, 22548578290
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OFFSET
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0,1
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COMMENTS
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Number of vertices into building blocks of 3d objects with 7 vertices.
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LINKS
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FORMULA
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a(n) = a(n-1)*2 + 14.
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EXAMPLE
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a(0) = 7+14+7;
a(0) = 7+14+28+14+7;
a(0) = 7+14+28+56+28+14+7;
a(0) = 7+14+28+56+112+56+28+14+7.
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MATHEMATICA
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CoefficientList[Series[-((14 (x - 2))/(2 x^2 - 3 x + 1)), {x, 0, 40}], x] (* Vincenzo Librandi, Jun 01 2014 *)
LinearRecurrence[{3, -2}, {28, 70}, 30] (* Harvey P. Dale, Oct 05 2015 *)
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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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