Main diagonal of Kimberling's expulsion array (A035486).

Terms

a(0) =1a(1) =3a(2) =5a(3) =4a(4) =10a(5) =7a(6) =15a(7) =8a(8) =20a(9) =9a(10) =18a(11) =24a(12) =31a(13) =14a(14) =28a(15) =22a(16) =42a(17) =35a(18) =33a(19) =46a(20) =53a(21) =6a(22) =36a(23) =23a(24) =2a(25) =55a(26) =62a(27) =59a(28) =76a(29) =65