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A302404
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Total domination number of the n-Moebius ladder.
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2
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0, 2, 2, 2, 3, 4, 4, 6, 6, 6, 7, 8, 8, 10, 10, 10, 11, 12, 12, 14, 14, 14, 15, 16, 16, 18, 18, 18, 19, 20, 20, 22, 22, 22, 23, 24, 24, 26, 26, 26, 27, 28, 28, 30, 30, 30, 31, 32, 32, 34, 34, 34, 35, 36, 36, 38, 38, 38, 39, 40, 40, 42, 42, 42, 43, 44, 44, 46, 46, 46, 47
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OFFSET
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0,2
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COMMENTS
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Extended to a(0)-a(2) using the formula/recurrence.
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LINKS
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FORMULA
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a(n) = (3 - (-1)^n + 4*n + cos(n*Pi/3) - 3*cos(2*n*Pi/3) + sqrt(3)*sin(n*Pi/3) + sin(2*n*Pi/3)/sqrt(3))/6.
a(n) = a(n-1) + a(n-6) - a(n-7).
G.f.: x*(2 + x^3 + x^4)/((1 - x)^2*(1 + x + x^2 + x^3 + x^4 + x^5)).
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MATHEMATICA
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Table[(3 - (-1)^n + 4 n + Cos[n Pi/3] - 3 Cos[2 n Pi/3] + Sqrt[3] Sin[n Pi/3] + Sin[2 n Pi/3]/Sqrt[3])/6, {n, 0, 20}]
LinearRecurrence[{1, 0, 0, 0, 0, 1, -1}, {2, 2, 2, 3, 4, 4, 6}, {0, 50}]
CoefficientList[Series[x (2 + x^3 + x^4)/((-1 + x)^2 (1 + x + x^2 + x^3 + x^4 + x^5)), {x, 0, 20}], x]
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PROG
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(PARI) x='x+O('x^50); concat(0, Vec(x*(2+x^3+x^4)/((1-x)^2*(1+x+x^2+x^3+x^4+x^5)))) \\ G. C. Greubel, Apr 09 2018
(Magma) I:=[2, 2, 2, 3, 4, 4, 6]; [0] cat [n le 7 select I[n] else Self(n-1) + Self(n-6) - Self(n-7): n in [1..50]]; // G. C. Greubel, Apr 09 2018
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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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