E.g.f.: Sum_{n>=0} arcsin(2^n*x)^n/n!.A168405E.g.f.: Sum_{n>=0} arcsin(2^n*x)^n/n!.Terms a(0) =1a(1) =2a(2) =16a(3) =520a(4) =66560a(5) =33882400a(6) =69055283200External referencesoeis: A168405