T(n,n-3), array T as in A038730.

Terms

a(0) =1a(1) =8a(2) =38a(3) =141a(4) =455a(5) =1350a(6) =3805a(7) =10395a(8) =27875a(9) =73945a(10) =194961a(11) =512303a(12) =1343768a(13) =3521381a(14) =9223435a(15) =24152800a(16) =63239810a(17) =165572615a(18) =433485350a(19) =1134892290a(20) =2971202146a(21) =7778726798a(22) =20364993198a(23) =53316270346a(24) =139583838315