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

Terms

a(0) =2a(1) =6a(2) =4a(3) =20a(4) =16a(5) =8a(6) =70a(7) =60a(8) =40a(9) =16a(10) =252a(11) =224a(12) =168a(13) =96a(14) =32a(15) =924a(16) =840a(17) =672a(18) =448a(19) =224a(20) =64a(21) =3432a(22) =3168a(23) =2640a(24) =1920a(25) =1152a(26) =512a(27) =128a(28) =12870a(29) =12012