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 A012867 Numerators of coefficients in Taylor series expansion of log(cotan(x)*arctan(x)). 2
 0, -2, 1, -313, 317, -7813, 6895597, -61916737, 10655226077, -41786390722733, 613552118040217, -41640337444573141, 6761598195684420293, -140000933764069408573, 81775784693678733811, -368555295637618487393608489, 41000094641259185671029500461, -243445658683280857337557514581 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..250 EXAMPLE -(2/3)*x^2 + (1/15)*x^4 - (313/2835)*x^6 + (317/5670)*x^8 - (7813/155925)*x^10 + ... MATHEMATICA Numerator[Take[CoefficientList[Series[Log[Cot[x]ArcTan[x]], {x, 0, 40}], x], {1, -1, 2}]] (* Harvey P. Dale, May 18 2012 *) CROSSREFS Cf. A202621. Sequence in context: A098879 A331818 A261437 * A178393 A272538 A087037 Adjacent sequences: A012864 A012865 A012866 * A012868 A012869 A012870 KEYWORD sign,frac AUTHOR Patrick Demichel (patrick.demichel(AT)hp.com) EXTENSIONS Corrected by N. J. A. Sloane, Dec 21 2011 STATUS approved

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Last modified December 10 02:09 EST 2022. Contains 358712 sequences. (Running on oeis4.)