tan(sec(x)*arctanh(x))=x+7/3!*x^3+185/5!*x^5+11471/7!*x^7...

A012843

tan(sec(x)*arctanh(x))=x+7/3!*x^3+185/5!*x^5+11471/7!*x^7...

Terms

    a(0) =1a(1) =7a(2) =185a(3) =11471a(4) =1263185a(5) =215079159a(6) =52220520521

External references