A013264 arcsinh(log(x+1)-sinh(x))=-1/2!*x^2+1/3!*x^3-6/4!*x^4+23/5!*x^5...

-1, 1, -6, 23, -105, 614, -3500, 23785, -168525, 1248014, -10232046, 87236225, -878874997, 11019659832, -176261549880, 3445590738361, -73605307413177, 1643075339474150, -37315705749869570, 854635215667984933