Expansion of sin(tan(x))*x.A009508Expansion of sin(tan(x))*x.Terms a(0) =0a(1) =2a(2) =4a(3) =-18a(4) =-2200a(5) =-150150a(6) =-11618004a(7) =-1078005082a(8) =-118928710576External referencesoeis: A009508