a(0) = 2, a(1) = 2, and for n > 1, a(n) = a(n-1) + a((a(n-1) - 1) mod n).

Terms

a(0) =2a(1) =2a(2) =4a(3) =6a(4) =8a(5) =12a(6) =24a(7) =28a(8) =34a(9) =58a(10) =86a(11) =120a(12) =240a(13) =252a(14) =504a(15) =538a(16) =596a(17) =598a(18) =604a(19) =1108a(20) =1136a(21) =1138a(22) =1676a(23) =2784a(24) =5568a(25) =6166a(26) =6172a(27) =6710a(28) =7308a(29) =14616