T(n,3), array T as in A054098.

Terms

a(0) =4a(1) =11a(2) =36a(3) =148a(4) =758a(5) =4640a(6) =33018a(7) =267716a(8) =2436218a(9) =24587064a(10) =272556602a(11) =3292267868a(12) =43042354506a(13) =605561401328