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 A047683 a(n) = 5^(2*n)*(5^(2*n)-1)*Bernoulli(2*n)/(2*n). 3
 50, -3250, 968750, -635781250, 722480468750, -1257228613281250, 3104408581542968750, -10320446545227050781250, 44440884525382995605468750, -240617847532228950500488281250, 1599915691073966364860534667968750, -12816452064605408400845527648925781250 (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 PROG (PARI) a(n) = 5^(2*n)*(5^(2*n)-1)*bernfrac(2*n)/(2*n) \\ Andrew Howroyd, May 18 2020 CROSSREFS Column 4 of A241066. Row sums of even indexed rows of A211234. Sequence in context: A239653 A223661 A224111 * A010564 A183689 A248205 Adjacent sequences:  A047680 A047681 A047682 * A047684 A047685 A047686 KEYWORD sign AUTHOR EXTENSIONS Offset corrected by Andrew Howroyd, May 18 2020 STATUS approved

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Last modified July 1 16:27 EDT 2022. Contains 354973 sequences. (Running on oeis4.)