Expansion of tan(x)*sin(sin(x)).A009740Expansion of tan(x)*sin(sin(x)).Terms a(0) =0a(1) =2a(2) =0a(3) =88a(4) =704a(5) =50464a(6) =2089216a(7) =173223040a(8) =16120801280External referencesoeis: A009740