T(n,n), array T given by A047000.

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =23a(5) =83a(6) =299a(7) =1107a(8) =4122a(9) =15523a(10) =58769a(11) =223848a(12) =856085a(13) =3286687a(14) =12656513a(15) =48871469a(16) =189145479a(17) =733547091a(18) =2849962925a(19) =11090427510a(20) =43219527353a(21) =168645172164a(22) =658834266936