-arctan(log(x+1)-arctanh(x))=1/2!*x^2+6/4!*x^4+90/6!*x^6+2520/8!*x^8...

A013297

-arctan(log(x+1)-arctanh(x))=1/2!*x^2+6/4!*x^4+90/6!*x^6+2520/8!*x^8...

Terms

    a(0) =0a(1) =1a(2) =6a(3) =90a(4) =2520a(5) =120960a(6) =9979200a(7) =1377295920a(8) =285145660800

External references