E..g.f. exp(tanh(x)/exp(x)).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =-4a(4) =9a(5) =52a(6) =-175a(7) =-1370a(8) =5985a(9) =60216a(10) =-320063a(11) =-3929550a(12) =24549745a(13) =354693796a(14) =-2543955167a(15) =-42233123938a(16) =341610526145