Triangle T(n, k, q) = (1-q^n)*( binomial(n, k) - 1 ) + 1, with q = 3, read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-7a(5) =1a(6) =1a(7) =-51a(8) =-51a(9) =1a(10) =1a(11) =-239a(12) =-399a(13) =-239a(14) =1a(15) =1a(16) =-967a(17) =-2177a(18) =-2177a(19) =-967a(20) =1a(21) =1a(22) =-3639a(23) =-10191a(24) =-13831a(25) =-10191a(26) =-3639a(27) =1a(28) =1a(29) =-13115