T(n,n-2), array T as in A047040; T(n-2,n), array T given by A047050.

Terms

a(0) =1a(1) =2a(2) =5a(3) =9a(4) =23a(5) =66a(6) =404a(7) =715a(8) =3244a(9) =12945a(10) =49742a(11) =238048a(12) =996158a(13) =3991995a(14) =15684363a(15) =64972818a(16) =263344734a(17) =1051693340a(18) =4160663948a(19) =16706844738a(20) =66843638750a(21) =266105167977