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A016760
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a(n) = (2*n+1)^8.
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7
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1, 6561, 390625, 5764801, 43046721, 214358881, 815730721, 2562890625, 6975757441, 16983563041, 37822859361, 78310985281, 152587890625, 282429536481, 500246412961, 852891037441, 1406408618241, 2251875390625, 3512479453921, 5352009260481, 7984925229121, 11688200277601
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: -(1+6552*x +331612*x^2 +2485288*x^3 +4675014*x^4 +2485288*x^5 +331612*x^6 +6552*x^7 +x^8)/(x-1)^9 . - R. J. Mathar, Jul 07 2017
Product_{n>=1} (1 - 1/a(n)) = Pi*cosh(Pi/2)*(cos(Pi/sqrt(2)) + cosh(Pi/sqrt(2)))/32. - Amiram Eldar, Jan 28 2021
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MATHEMATICA
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PROG
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(PARI) vector(30, n, n--; (2*n+1)^8) \\ G. C. Greubel, Sep 15 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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