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 A003414 Floor( Bernoulli(2*n)/(-4*n) ). 2
 -1, 0, -1, 0, -1, 0, -1, 0, -2, 13, -141, 1803, -27414, 487468, -10026348, 236192433, -6317862398, 190439655626, -6425425249653, 241207241774250, -10020155328258127, 458387180159766538, -22989944171828251746, 1259023596072554784854, -75008667460769643668558 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,9 REFERENCES F. Hirzebruch et al., Manifolds and Modular Forms, Vieweg, 2nd ed. 1994, p. 130. D. C. Ravenel, Complex cobordism theory for number theorists, Lecture Notes in Mathematics, 1326, Springer-Verlag, Berlin-New York, 1988, pp. 123-133. LINKS T. D. Noe, Table of n, a(n) for n = 1..100 EXAMPLE a(10) = 13 because the 20th (2 * 10) Bernoulli number is -174611/330, and that divided by (-4) * 10 is approximately 13.2281. MATHEMATICA Table[Floor[BernoulliB[2n]/(-4n)], {n, 24}] (* Alonso del Arte, Jul 11 2012 *) CROSSREFS Sequence in context: A349291 A318003 A143137 * A003326 A207493 A003581 Adjacent sequences:  A003411 A003412 A003413 * A003415 A003416 A003417 KEYWORD sign AUTHOR STATUS approved

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Last modified August 7 23:50 EDT 2022. Contains 355995 sequences. (Running on oeis4.)