T(n,n), array T as in A054090.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =25a(6) =105a(7) =547a(8) =3367a(9) =24033a(10) =195169a(11) =1777651a(12) =17950551a(13) =199059673a(14) =2405063017a(15) =31448531955a(16) =442501797655