Triangular array: the fission of ((x+1)^n) by ((2x+1)^n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =10a(5) =7a(6) =8a(7) =28a(8) =34a(9) =15a(10) =16a(11) =72a(12) =124a(13) =98a(14) =31a(15) =32a(16) =176a(17) =392a(18) =444a(19) =258a(20) =63a(21) =64a(22) =416a(23) =1136a(24) =1672a(25) =1404a(26) =642a(27) =127a(28) =128a(29) =960