T(n,n-3), array T as in A054106.

Terms

a(0) =1a(1) =3a(2) =8a(3) =15a(4) =27a(5) =44a(6) =67a(7) =97a(8) =135a(9) =182a(10) =239a(11) =307a(12) =387a(13) =480a(14) =587a(15) =709a(16) =847a(17) =1002a(18) =1175a(19) =1367a(20) =1579a(21) =1812a(22) =2067a(23) =2345a(24) =2647a(25) =2974a(26) =3327a(27) =3707a(28) =4115a(29) =4552