a(n) = (2*n)! * D_{2*n}, where D_{2*n} = (1/Pi) * Integral_{x=0..oo} [1 - x^(2*n) / Product_{j=1..n} (x^2+j^2)] dx.
A013926
a(n) = (2*n)! * D_{2*n}, where D_{2*n} = (1/Pi) * Integral_{x=0..oo} [1 - x^(2*n) / Product_{j=1..n} (x^2+j^2)] dx.
Terms
- a(0) =1a(1) =28a(2) =1434a(3) =118960a(4) =14611150a(5) =2494744728a(6) =565526968692
External references
- oeis: A013926