Triangle read by rows: T(n, k) = 2^n*(q^k - 1)*(q^(n - k) - 1) + 1, where q = 3.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =17a(5) =1a(6) =1a(7) =129a(8) =129a(9) =1a(10) =1a(11) =833a(12) =1025a(13) =833a(14) =1a(15) =1a(16) =5121a(17) =6657a(18) =6657a(19) =5121a(20) =1a(21) =1a(22) =30977a(23) =40961a(24) =43265a(25) =40961a(26) =30977a(27) =1a(28) =1a(29) =186369