Kimberling's expulsion array read by antidiagonals.

Terms

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