\operatorname{arcsinh} (x) = x - \frac{1}{6} x^{3} + \frac{3}{40} x^{5} - \frac{5}{112} x^{7} + \frac{35}{1152} x^{9} - \frac{63}{2816} x^{11} + \frac{231}{13312} \\ \quad{}\quad{}x^{13} - \frac{143}{10240} x^{15} + \operatorname{O} \bigl(x^{16}\bigr)

`&operatorname`(arcsinh)(x) = series(1*x-1/6*x^3+3/40*x^5-5/112*x^7+35/1152*x^9-63/2816*x^11+231/13312*x^13-143/10240*x^15+O(x^16),x,16)