Triangle T(n,k) = 2*binomial(n,k)^2 - 1, read by rows, 0<=k<=n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =7a(5) =1a(6) =1a(7) =17a(8) =17a(9) =1a(10) =1a(11) =31a(12) =71a(13) =31a(14) =1a(15) =1a(16) =49a(17) =199a(18) =199a(19) =49a(20) =1a(21) =1a(22) =71a(23) =449a(24) =799a(25) =449a(26) =71a(27) =1a(28) =1a(29) =97