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 A090598 Numerator of ((integral_{x = 0..1/2} 1/(1+x^2)^(n + 1/2) dx) * sqrt(1/5)). 0
 1, 14, 328, 10800, 458880, 23911680, 1477278720, 105623562240, 8582728089600, 781478859571200, 78834419151667200, 8729454895025356800, 1052840115930503577600, 137399767923711541248000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Denominator is b(n)=5^(n-1)*(2*n)!/(n!*2^n). E.g., b(3)=375. LINKS EXAMPLE a(3) = 328 since f(n) = 328/375. MATHEMATICA f[n_] := (5^(n - 1/2)(2n - 1)!!Integrate[1/(1 + x^2)^(n + 1/2), {x, 0, 1/2}]); Table[ f[n], {n, 1, 15}] (* Robert G. Wilson v, Feb 27 2004 *) CROSSREFS Sequence in context: A275397 A275262 A241373 * A277769 A060075 A222984 Adjacent sequences:  A090595 A090596 A090597 * A090599 A090600 A090601 KEYWORD nonn,frac AUTHOR Al Hakanson (hawkuu(AT)excite.com), Feb 25 2004 EXTENSIONS Edited and extended by Robert G. Wilson v, Feb 27 2004 STATUS approved

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Last modified June 27 23:11 EDT 2022. Contains 354903 sequences. (Running on oeis4.)