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A060892
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a(n) = n^8 - n^6 + n^4 - n^2 + 1.
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2
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1, 1, 205, 5905, 61681, 375601, 1634221, 5649505, 16519105, 42521761, 99009901, 212601841, 427016305, 810932305, 1468297741, 2551550401, 4278255361, 6951703105, 10986053005, 16936647121, 25536159601, 37737287281, 54762727405, 78163228705, 109884542401
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OFFSET
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0,3
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COMMENTS
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a(n) = Phi_20(n) where Phi_k(x) is the k-th cyclotomic polynomial.
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LINKS
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FORMULA
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G.f.: (1-8*x+232*x^2+4012*x^3+15958*x^4+15832*x^5+4096*x^6+196*x^7+x^8)/ (1-x)^9. [Colin Barker, Apr 22 2012]
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MAPLE
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numtheory[cyclotomic](20, n) ;
end proc:
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MATHEMATICA
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Cyclotomic[20, Range[0, 30]] (* Paolo Xausa, Feb 26 2024 *)
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PROG
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(PARI) a(n) = n^8 - n^6 + n^4 - n^2 + 1; \\ Harry J. Smith, Jul 14 2009
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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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