T(n,n), array T as in A047130.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =28a(5) =84a(6) =272a(7) =911a(8) =3885a(9) =14049a(10) =50891a(11) =185464a(12) =735146a(13) =2794719a(14) =10565837a(15) =39940553a(16) =155711860a(17) =601589056a(18) =2317413464a(19) =8920255482a(20) =34742183340a(21) =135196049411a(22) =525683426601