Triangular array formed from elements to right of middle of Pascal's triangle.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =4a(5) =1a(6) =10a(7) =5a(8) =1a(9) =15a(10) =6a(11) =1a(12) =35a(13) =21a(14) =7a(15) =1a(16) =56a(17) =28a(18) =8a(19) =1a(20) =126a(21) =84a(22) =36a(23) =9a(24) =1a(25) =210a(26) =120a(27) =45a(28) =10a(29) =1