a(n) is the index of the first occurrence of n in A317359.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =10a(5) =39a(6) =45a(7) =25a(8) =17a(9) =527a(10) =537a(11) =55a(12) =34a(13) =134a(14) =197a(15) =309a(16) =636a(17) =66a(18) =97a(19) =555a(20) =176a(21) =2100a(22) =285a(23) =4247a(24) =4499a(25) =155a(26) =8729a(27) =591a(28) =325a(29) =1144