T(n,n-3), array T as in A047040; T(n-3,n), array T given by A047050.

Terms

a(0) =1a(1) =3a(2) =9a(3) =23a(4) =66a(5) =202a(6) =443a(7) =1276a(8) =3978a(9) =25890a(10) =49742a(11) =238048a(12) =996158a(13) =3991995a(14) =19676358a(15) =84649176a(16) =347993910a(17) =1399687250a(18) =5908345108a(19) =24362871006a(20) =98862536024a(21) =396986601275