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A047682
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a(n) = 4^(2*n)*(4^(2*n)-1)*Bernoulli(2*n)/(2*n).
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3
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20, -544, 66560, -17895424, 8329625600, -5937093935104, 6004799480791040, -8176700159200067584, 14421891569272362106880, -31983597922505761818148864, 87107695717210805652024197120, -285816431841945942589104606674944, 1112035502745012017553352712530165760
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OFFSET
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1,1
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REFERENCES
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J. W. Milnor and J. D. Stasheff, Characteristic Classes, Princeton, 1974, p. 283.
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LINKS
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MATHEMATICA
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f[n_]:=Module[{c=2n, x}, x=4^c; (x(x-1)BernoulliB[c])/c]; Array[f, 20] (* Harvey P. Dale, Feb 19 2013 *)
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PROG
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(PARI) a(n) = 4^(2*n)*(4^(2*n)-1)*bernfrac(2*n)/(2*n) \\ Andrew Howroyd, May 18 2020
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CROSSREFS
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Row sums of even-indexed rows of A211233.
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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Offset corrected and terms a(13) and beyond from Andrew Howroyd, May 18 2020
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STATUS
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approved
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