A012881 exp(sech(x)*arcsinh(x))=1+x+1/2!*x^2-3/3!*x^3-15/4!*x^4+5/5!*x^5...

1, 1, 1, -3, -15, 5, 345, 889, -11263, -82167, 455025, 7869301, -16466703, -906141171, -746021367, 128450716913, 480286325633, -22562588189167, -150637957014303, 4955964959446253, 46203820378253425