Expansion of sinh(tan(x)*x).A009611Expansion of sinh(tan(x)*x).Terms a(0) =0a(1) =2a(2) =8a(3) =216a(4) =8896a(5) =553120a(6) =48069504a(7) =5564225408a(8) =827281160192External referencesoeis: A009611