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A047682 4^(2*n)*(4^(2*n)-1)*bernoulli(2*n)/(2*n). 1
20, -544, 66560, -17895424, 8329625600, -5937093935104, 6004799480791040, -8176700159200067584, 14421891569272362106880, -31983597922505761818148864, 87107695717210805652024197120, -285816431841945942589104606674944 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

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

LINKS

Table of n, a(n) for n=0..11.

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 *)

CROSSREFS

Sequence in context: A180882 A202920 A210486 * A231249 A012568 A259057

Adjacent sequences:  A047679 A047680 A047681 * A047683 A047684 A047685

KEYWORD

sign

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 21 11:42 EDT 2019. Contains 327253 sequences. (Running on oeis4.)