a(1)=0, and a(n+1) is the position of first occurrence of a(n) in the decimal expansion of 1/Pi.

Terms

a(0) =0a(1) =5a(2) =19a(3) =41a(4) =717a(5) =925a(6) =358a(7) =1004a(8) =5044a(9) =6981a(10) =2520a(11) =7559a(12) =139a(13) =694a(14) =919a(15) =40a(16) =36a(17) =126a(18) =663a(19) =1745a(20) =3950a(21) =12447a(22) =18530a(23) =22257a(24) =82998a(25) =27887a(26) =5940a(27) =1387a(28) =3601a(29) =2344