a(n) = (2n+1)! * [x^(2n+1)]; expansion of arcsin(tan(x)+arcsin(x)).

A012950

a(n) = (2n+1)! * [x^(2n+1)]; expansion of arcsin(tan(x)+arcsin(x)).

Terms

    a(0) =2a(1) =11a(2) =433a(3) =47777a(4) =10445209a(5) =3792307917

External references