Column 0 of triangle A141760.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =26a(6) =154a(7) =1188a(8) =11474a(9) =134432a(10) =1863168a(11) =29936846a(12) =548625820a(13) =11315025894a(14) =259733293774