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 A280656 Denominator of (Sum_{k=0..n^2-1} (-1)^k*sqrt(Pi)/(Gamma(1/2-k)*Gamma(1+k))) - n. 2
 1, 16, 32768, 67108864, 70368744177664, 147573952589676412928, 19807040628566084398385987584, 1329227995784915872903807060280344576, 365375409332725729550921208179070754913983135744, 25108406941546723055343157692830665664409421777856138051584 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(n) is a power of 2. LINKS Table of n, a(n) for n=1..10. FORMULA a(n)=Denominator of Sum_{k=0..n^2-1}(Binomial(2k,k)/4^k)-n. MATHEMATICA Denominator[Table[Sum[Binomial[2k, k]/4^k, {k, 0, n^2-1}]-n, {n, 1, 10}]] CROSSREFS Cf. A280655 (numerators). Sequence in context: A087518 A249971 A221244 * A265662 A253912 A017548 Adjacent sequences: A280653 A280654 A280655 * A280657 A280658 A280659 KEYWORD nonn,frac AUTHOR Ralf Steiner, Apr 12 2017 STATUS approved

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Last modified July 12 14:24 EDT 2024. Contains 374251 sequences. (Running on oeis4.)