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

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =37a(5) =131a(6) =481a(7) =1778a(8) =6637a(9) =25010a(10) =94819a(11) =361275a(12) =1382507a(13) =5309449a(14) =20452432a(15) =78991548a(16) =305779341a(17) =1186056909a(18) =4608647096a(19) =17936112649a(20) =69903546693a(21) =272788289379