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A047681 3^(2*n)*(3^(2*n)-1)*bernoulli(2*n)/(2*n). 1
6, -54, 2106, -179334, 26414586, -5957217414, 1906398972666, -821369346492294, 458382160232420346, -321645776191296739974, 277173760840187306341626, -287758284647458145849816454, 354245505704926834826124160506, -510230879113388713374134585497734 (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

Table of n, a(n) for n=1..14.

Index entries for sequences related to Bernoulli numbers.

CROSSREFS

Sequence in context: A171681 A267837 A049037 * A075575 A073655 A119222

Adjacent sequences:  A047678 A047679 A047680 * A047682 A047683 A047684

KEYWORD

sign

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 22 05:47 EDT 2019. Contains 327287 sequences. (Running on oeis4.)