Negative of the Hankel transform of C(n) - C(n+2), where C = A000108.

Terms

a(0) =1a(1) =4a(2) =-17a(3) =17a(4) =72a(5) =-305a(6) =305a(7) =1292a(8) =-5473a(9) =5473a(10) =23184a(11) =-98209a(12) =98209a(13) =416020a(14) =-1762289a(15) =1762289a(16) =7465176a(17) =-31622993a(18) =31622993a(19) =133957148a(20) =-567451585a(21) =567451585a(22) =2403763488a(23) =-10182505537a(24) =10182505537a(25) =43133785636a(26) =-182717648081a(27) =182717648081a(28) =774004377960