A047682 - OEIS

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A047682

a(n) = 4^(2*n)*(4^(2*n)-1)*Bernoulli(2*n)/(2*n).

20, -544, 66560, -17895424, 8329625600, -5937093935104, 6004799480791040, -8176700159200067584, 14421891569272362106880, -31983597922505761818148864, 87107695717210805652024197120, -285816431841945942589104606674944, 1112035502745012017553352712530165760

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

REFERENCES

J. W. Milnor and J. D. Stasheff, Characteristic Classes, Princeton, 1974, p. 283.

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..100

Index entries for sequences related to Bernoulli numbers.

MATHEMATICA

f[n_]:=Module[{c=2n, x}, x=4^c; (x(x-1)BernoulliB[c])/c]; Array[f, 20] (* Harvey P. Dale, Feb 19 2013 *)

PROG

(PARI) a(n) = 4^(2*n)*(4^(2*n)-1)*bernfrac(2*n)/(2*n) \\ Andrew Howroyd, May 18 2020