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Michael Somos, <a href="http://cisgrail.eecs.csuohio.edu/~somos/rfmc.txt">Rational Function Multiplicative Coefficients</a>, 2014.

G.f.: x * (1 - x^2) * (1 - x^6) / (1 + x^10) = x / (1 + x^2) - x^5 / (1 + x^10). a(n + 20) = -a(-n) = a(n). a(2*n) = a(5*n) = 0.).

a(n + 20) = -a(-n) = a(n). a(2*n) = a(5*n) = 0.

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Cf. A000012, A053694.

Michael Somos, <a href="http://cis.csuohio.edu/~somos/rfmc.txt">Rational Function Multiplicative Coefficients</a>>, 2014.

<a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (0, ,0, ,0, ,0, ,0, ,0, ,0, ,0, ,0, -,-1).

Sum_{k=1..n} abs(a(k)) ~ 2*n/5. - Amiram Eldar, Jan 29 2024

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