a(n) = n!*2^(n+1) * (Integral_{x = 0..1} 1/(1+x^2)^(n+1) dx) - Pi*(2*n)!/(2^(n+1)*n!).
A087547
a(n) = n!*2^(n+1) * (Integral_{x = 0..1} 1/(1+x^2)^(n+1) dx) - Pi*(2*n)!/(2^(n+1)*n!).
Terms
- a(0) =0a(1) =1a(2) =4a(3) =22a(4) =160a(5) =1464a(6) =16224a(7) =211632a(8) =3179520a(9) =54092160a(10) =1028113920a(11) =21594021120a(12) =496702402560
External references
- oeis: A087547