Denominators of the partial sums of the reciprocals of the squarefree kernel function (A007947).

Terms

a(0) =1a(1) =2a(2) =6a(3) =3a(4) =15a(5) =10a(6) =70a(7) =35a(8) =105a(9) =210a(10) =2310a(11) =385a(12) =5005a(13) =10010a(14) =30030a(15) =15015a(16) =255255a(17) =510510a(18) =9699690a(19) =4849845a(20) =4849845a(21) =9699690a(22) =223092870a(23) =111546435a(24) =22309287a(25) =44618574a(26) =44618574a(27) =3187041a(28) =92424189a(29) =308080630