E.g.f.: exp(6*arcsin(x))-6*arcsin(x).

Terms

a(0) =1a(1) =0a(2) =36a(3) =216a(4) =1440a(5) =9936a(6) =74880a(7) =608040a(8) =5391360a(9) =51732000a(10) =539136000a(11) =6055025400a(12) =73322496000a(13) =950831881200