Column 1 of triangle A111553.

Terms

a(0) =1a(1) =2a(2) =10a(3) =72a(4) =632a(5) =6352a(6) =70912a(7) =864192a(8) =11371072a(9) =160333952a(10) =2409420032a(11) =38428442112a(12) =648333665792