tan(arctanh(x)*arcsinh(x))=2/2!*x^2+4/4!*x^4+398/6!*x^6+10344/8!*x^8...

A012753

tan(arctanh(x)*arcsinh(x))=2/2!*x^2+4/4!*x^4+398/6!*x^6+10344/8!*x^8...

Terms

    a(0) =0a(1) =2a(2) =4a(3) =398a(4) =10344a(5) =1808442a(6) =161718060a(7) =45246852870

External references