Total preorders.

Terms

a(0) =1a(1) =10a(2) =79a(3) =602a(4) =4682a(5) =38072a(6) =326570a(7) =2964992a(8) =28506383a(9) =289973248a(10) =3116028865a(11) =35308153600a(12) =421048783264