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Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/AntiprismGraph.html">Antiprism Graph</a>
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LinearRecurrence[{3, 3, 1, 1, 1}, {3, 15, 57, 223, 863, 3333, 12883}, 2720]
Table[RootSum[-1 - # - #^2 - 3 #^3 - 3 #^4 + #^5 &, #^n &], {n, 20}]
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reviewed
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reviewed
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Colin Barker, <a href="/A284699/b284699.txt">Table of n, a(n) for n = 1..1000</a>
<a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (3, 3, 1, 1, 1).
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