A003272 - OEIS

A003272

a(n) = ceiling((-4n)/Bernoulli(2n)).

0, -24, 240, -504, 480, -264, 95, -24, 5, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0

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OFFSET

0,2

REFERENCES

Douglas C. Ravenel, Complex cobordism theory for number theorists, Lecture Notes in Mathematics, 1326, Springer-Verlag, Berlin-New York, 1988, pp. 123-133.

F. Hirzebruch et al., Manifolds and Modular Forms, Vieweg, 2nd ed. 1994, p. 130.

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

Index entries for sequences related to Bernoulli numbers.

MATHEMATICA

Table[Ceiling[(-4n)/BernoulliB[2n]], {n, 0, 75}] (* Alonso del Arte, Jul 19 2012 *)

PROG

(PARI) vector(75, n, n--; ceil(-4*n/bernfrac(2*n))) \\ G. C. Greubel, Jul 04 2019

(Magma) [Ceiling(-4*n/Bernoulli(2*n)): n in [0..75]]; // G. C. Greubel, Jul 04 2019

(Sage) [ceil(-4*n/bernoulli(2*n)) for n in (0..75)] # G. C. Greubel, Jul 04 2019

CROSSREFS

Sequence in context: A081863 A247825 A003264 * A003245 A006863 A335128

Adjacent sequences: A003269 A003270 A003271 * A003273 A003274 A003275

KEYWORD

sign

AUTHOR

N. J. A. Sloane

STATUS

approved