Number of partitions of 1 into distinct fractions i/j with 1<=i<j<=n and i,j coprime.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =6a(6) =10a(7) =15a(8) =23a(9) =36a(10) =47a(11) =70a(12) =87a(13) =132a(14) =283a(15) =434a(16) =471a(17) =772a(18) =825a(19) =1834a(20) =4368a(21) =5545a(22) =5648a(23) =9923a(24) =16464a(25) =19943a(26) =32323a(27) =75912a(28) =76167a(29) =140801