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A347481
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Number of total dominating sets in the n-dipyramidal graph.
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0
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4, 10, 25, 54, 104, 205, 410, 814, 1609, 3190, 6340, 12609, 25094, 49990, 99665, 198814, 396784, 792205, 1582210, 3160854, 6315929, 12622510, 25229900, 50435329, 100831054, 201598030, 403092385, 806017014, 1611762584, 3223085965, 6445461290, 12889772734
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OFFSET
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1,1
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COMMENTS
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Sequence extended to a(1) using the formula/recurrence.
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LINKS
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FORMULA
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a(n) = Lucas(n) + 2*cos(n*Pi/2) + 3*2^n - 3.
a(n) = 4*a(n-1) - 5*a(n-2) + 3*a(n-3) - 2*a(n-4) - a(n-5) + 2*a(n-6).
G.f.: -(x*(4 - 6*x + 5*x^2 - 8*x^3 - 9*x^4 + 8*x^5)/((-1 + x)*(-1 +
2*x)*(1 + x^2)*(-1 + x + x^2)).
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MATHEMATICA
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Table[LucasL[n] + 2 Cos[n Pi/2] + 3 2^n - 3, {n, 50}]
LinearRecurrence[{4, -5, 3, -2, -1, 2}, {4, 10, 25, 54, 104, 205}, 20]
CoefficientList[Series[-(4 - 6 x + 5 x^2 - 8 x^3 - 9 x^4 + 8 x^5)/((-1 + x) (-1 + 2 x) (1 + x^2) (-1 + x + x^2)), {x, 0, 20}], x]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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