Binomial transform of A014448.

Terms

a(0) =2a(1) =6a(2) =28a(3) =144a(4) =752a(5) =3936a(6) =20608a(7) =107904a(8) =564992a(9) =2958336a(10) =15490048a(11) =81106944a(12) =424681472a(13) =2223661056a(14) =11643240448a(15) =60964798464a(16) =319215828992