sec(arctanh(x)+arctan(x))=1+4/2!*x^2+80/4!*x^4+4480/6!*x^6...
A013180
sec(arctanh(x)+arctan(x))=1+4/2!*x^2+80/4!*x^4+4480/6!*x^6...
Terms
- a(0) =1a(1) =4a(2) =80a(3) =4480a(4) =462080a(5) =77248000a(6) =18902835200
External references
- oeis: A013180
A013180
sec(arctanh(x)+arctan(x))=1+4/2!*x^2+80/4!*x^4+4480/6!*x^6...