A013573 E.g.f. exp(arctanh(x)/exp(x))=1+x-1/2!*x^2+9/4!*x^4-20/5!*x^5+65/6!*x^6...

1, 1, -1, 0, 9, -20, 65, 406, -511, 21624, 88577, 1053426, 14764321, 143838916, 2193647521, 29669704702, 457719400449, 7433158061552, 128311987616769, 2329120580336746, 45112841958764321, 905762343424701116