T(n,n+3), array T as in A047100.

Terms

a(0) =1a(1) =4a(2) =15a(3) =57a(4) =215a(5) =812a(6) =3083a(7) =11750a(8) =44934a(9) =172401a(10) =663370a(11) =2559008a(12) =9894006a(13) =38331115a(14) =148770379a(15) =578346672a(16) =2251636041a(17) =8777816518a(18) =34261079538a(19) =133873978089a(20) =523638632149