A013496 exp(tanh(x)-arctanh(x))=1-4/3!*x^3-8/5!*x^5+160/6!*x^6-992/7!*x^7...

1, 0, 0, -4, 0, -8, 160, -992, 1792, -50304, 484224, -4573952, 38725632, -738222080, 8292976640, -127954033664, 1743232565248, -34953731964928, 521161362997248, -10769261343309824, 188842450602393600