arcsin(tanh(x)+tan(x))=2*x+8/3!*x^3+320/5!*x^5+31488/7!*x^7...

A013135

arcsin(tanh(x)+tan(x))=2*x+8/3!*x^3+320/5!*x^5+31488/7!*x^7...

Terms

    a(0) =2a(1) =8a(2) =320a(3) =31488a(4) =6241280a(5) =2048135168

External references