Position of second and last occurrence of n in A256918.

Terms

a(0) =2a(1) =6a(2) =9a(3) =12a(4) =8a(5) =14a(6) =30a(7) =17a(8) =20a(9) =28a(10) =123a(11) =23a(12) =201a(13) =32a(14) =25a(15) =39a(16) =300a(17) =46a(18) =825a(19) =43a(20) =34a(21) =125a(22) =946a(23) =51a(24) =27a(25) =203a(26) =47a(27) =52a(28) =3094a(29) =56