Hankel transform of A176280.

Terms

a(0) =1a(1) =3a(2) =12a(3) =56a(4) =280a(5) =1440a(6) =7488a(7) =39104a(8) =204544a(9) =1070592a(10) =5604864a(11) =29345792a(12) =153653248a(13) =804532224a(14) =4212572160a(15) =22057287680a(16) =115493404672a(17) =604731211776