Number of ways to partition 1 into distinct reduced fractions i/j with j <= n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =11a(7) =16a(8) =24a(9) =37a(10) =48a(11) =71a(12) =88a(13) =133a(14) =284a(15) =435a(16) =472a(17) =773a(18) =826a(19) =1835a(20) =4369a(21) =5546a(22) =5649a(23) =9924a(24) =16465a(25) =19944a(26) =32324a(27) =75913a(28) =76168a(29) =140802