307660953600domain: NAppears in sequencesDefine K(n) = Integral_{t=0..1} (-1/2)^n/(1+t)*((1-t)^2*t^2/(1+t))^n*dt and write K(n) = d(n)*log(2) - b(n)/a(n) where a(n), d(n), b(n) are positive integers; sequence gives a(n).at n=10A316912a(n) = n * 2^n * binomial(3*n, n).at n=10A378780