Binomial transform of A006053.

Terms

a(0) =0a(1) =1a(2) =3a(3) =9a(4) =26a(5) =74a(6) =209a(7) =588a(8) =1651a(9) =4631a(10) =12983a(11) =36388a(12) =101972a(13) =285741a(14) =800660a(15) =2243445a(16) =6286059a(17) =17613241a(18) =49351342a(19) =138279586a(20) =387451077a(21) =1085614208a(22) =3041824015a(23) =8523002359a(24) =23880923183a(25) =66912861640a(26) =187485674652a(27) =525323190505