Triangle read by rows: T(n, k) = Sum_{j=0..n} C(j, k)*C(j, n - k).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =11a(8) =11a(9) =1a(10) =1a(11) =19a(12) =46a(13) =19a(14) =1a(15) =1a(16) =29a(17) =127a(18) =127a(19) =29a(20) =1a(21) =1a(22) =41a(23) =281a(24) =517a(25) =281a(26) =41a(27) =1a(28) =1a(29) =55