a(0) = 1; a(n) = Sum_{1 <= k <= n and k|n} a(n-k).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =7a(6) =17a(7) =18a(8) =42a(9) =60a(10) =110a(11) =111a(12) =341a(13) =342a(14) =702a(15) =1154a(16) =2240a(17) =2241a(18) =6037a(19) =6038a(20) =15580a(21) =22320a(22) =38012a(23) =38013a(24) =122544a(25) =138125a(26) =261012a(27) =389594a(28) =796173a(29) =796174