a(1) = 1, a(n) = a(n - 1) + pi(a(n - 1)) + 1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =12a(5) =18a(6) =26a(7) =36a(8) =48a(9) =64a(10) =83a(11) =107a(12) =136a(13) =169a(14) =209a(15) =256a(16) =311a(17) =376a(18) =451a(19) =539a(20) =639a(21) =755a(22) =889a(23) =1044a(24) =1220a(25) =1420a(26) =1644a(27) =1904a(28) =2196a(29) =2524