Triangle read by rows: T(n, m) = binomial(n, m)* Sum_{k=0..m} binomial(n, k) for 0 <= m <= n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =6a(5) =4a(6) =1a(7) =12a(8) =21a(9) =8a(10) =1a(11) =20a(12) =66a(13) =60a(14) =16a(15) =1a(16) =30a(17) =160a(18) =260a(19) =155a(20) =32a(21) =1a(22) =42a(23) =330a(24) =840a(25) =855a(26) =378a(27) =64a(28) =1a(29) =56