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 A292706 a(n) = 1/2*((-1)^n*E(2*n-1,n) - E(2*n-1,0)), where E(n,x) is the Euler polynomial. 1
 0, 1, -31, 2060, -242972, 44808921, -11905513623, 4306834677808, -2035350070549744, 1217544864812657225, -899267301542329562375, 803729476432302540694956, -854933675015747706872042556, 1067328531318200947345698975505, -1545426104859564195269842899644047 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 REFERENCES M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions, 1972, Ch. 23. LINKS FORMULA a(n) = 1^(2*n-1) - 2^(2*n-1) + ... + (-1)^n*(n-1)^(2*n-1). |a(n)| ~ 1/(1+e^(-2))*(n-1)^(2*n-1) = 0.88079707...*(n-1)^(2*n-1) as n goes to infinity. MATHEMATICA Table[((-1)^n EulerE[2n-1, n]-EulerE[2n-1, 0])/2, {n, 10}] Map[Total[(Map[(-1)^# (#-1)&, Range[#]])^(2#-1)]&, Range[10]] (* Peter J. C. Moses, Sep 21 2017 *) PROG (PARI) a(n) = sum(k=1, n-1, (-1)^(k+1)*k^(2*n-1)); \\ Michel Marcus, Sep 22 2017 CROSSREFS Cf. A143074, A157805. Sequence in context: A184488 A218352 A297549 * A212156 A297806 A219076 Adjacent sequences:  A292703 A292704 A292705 * A292707 A292708 A292709 KEYWORD sign AUTHOR Vladimir Shevelev, Sep 21 2017 EXTENSIONS More terms from Peter J. C. Moses, Sep 21 2017 STATUS approved

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Last modified August 3 08:53 EDT 2020. Contains 336197 sequences. (Running on oeis4.)