Active part of Kimberling's expulsion array as a triangular array.

Terms

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