Column 0 of triangle A109152.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =22a(5) =94a(6) =450a(7) =2366a(8) =13450a(9) =81802a(10) =527826a(11) =3590294a(12) =25609782a(13) =190753502a(14) =1478339866a(15) =11884997478a(16) =98859026322a(17) =848881803218