Triangle read by rows: T(n,k) = 1 + (q-binomial coefficient [n,k] for q=3) - binomial(n,k).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =11a(8) =11a(9) =1a(10) =1a(11) =37a(12) =125a(13) =37a(14) =1a(15) =1a(16) =117a(17) =1201a(18) =1201a(19) =117a(20) =1a(21) =1a(22) =359a(23) =10997a(24) =33861a(25) =10997a(26) =359a(27) =1a(28) =1a(29) =1087