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A032286
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"DIK" (bracelet, indistinct, unlabeled) transform of 5,5,5,5...
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1
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5, 20, 65, 240, 957, 4360, 21075, 107760, 566375, 3039903, 16529655, 90798535, 502567665, 2799313350, 15674233045, 88163236380, 497851322925, 2821131185200, 16035833020335, 91404088484949, 522308650924665, 2991403124124120, 17168050141237515, 98716282462085185
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OFFSET
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1,1
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LINKS
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FORMULA
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G.f.: (5*x*(1+3*x+x^2)/((1-x)*(1-6*x^2)) + Sum_{d>0} phi(d)*log((1-x^d)/(1-6*x^d))/d)/2. - Andrew Howroyd, Jun 20 2018
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PROG
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(PARI) seq(n)={Vec(5*x*(1+3*x+x^2)/((1-x)*(1-6*x^2)) + sum(d=1, n, eulerphi(d)/d*log((1-x^d)/(1-6*x^d) + O(x*x^n))))/2} \\ Andrew Howroyd, Jun 20 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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