sinh(arctan(arctan(x)))=x-3/3!*x^3+49/5!*x^5-1859/7!*x^7+119617/9!*x^9...

A012206

sinh(arctan(arctan(x)))=x-3/3!*x^3+49/5!*x^5-1859/7!*x^7+119617/9!*x^9...

Terms

    a(0) =1a(1) =-3a(2) =49a(3) =-1859a(4) =119617a(5) =-10283171a(6) =678311217a(7) =246695568861

External references