tan(sec(x)*arctan(x))=x+3/3!*x^3+65/5!*x^5+2051/7!*x^7+154209/9!*x^9...
A012804
tan(sec(x)*arctan(x))=x+3/3!*x^3+65/5!*x^5+2051/7!*x^7+154209/9!*x^9...
Terms
- a(0) =1a(1) =3a(2) =65a(3) =2051a(4) =154209a(5) =14263139a(6) =2239618017a(7) =411001918627
External references
- oeis: A012804