Euler transform of A000389.

Terms

a(0) =1a(1) =7a(2) =28a(3) =105a(4) =357a(5) =1232a(6) =4067a(7) =13301a(8) =42357a(9) =132845a(10) =409262a(11) =1243767a(12) =3727360a(13) =11036649a(14) =32300795a(15) =93538278a(16) =268164868a(17) =761656685a(18) =2144259516a(19) =5986658951a(20) =16583102077a(21) =45593269265a(22) =124464561544a(23) =337479729179a(24) =909156910290