Column 1 of triangle A152391.

Terms

a(0) =1a(1) =2a(2) =6a(3) =28a(4) =150a(5) =930a(6) =6286a(7) =46120a(8) =359946a(9) =2973650a(10) =25766950a(11) =233274228a(12) =2195351158a(13) =21414166970a(14) =215809803270