Denominator of b(n) = Sum_{k'<=n} 1/k', where k' denotes the squarefree numbers.

Terms

a(0) =1a(1) =2a(2) =6a(3) =6a(4) =30a(5) =5a(6) =35a(7) =35a(8) =35a(9) =70a(10) =770a(11) =770a(12) =10010a(13) =5005a(14) =15015a(15) =15015a(16) =255255a(17) =255255a(18) =4849845a(19) =4849845a(20) =1616615a(21) =3233230a(22) =74364290a(23) =74364290a(24) =74364290a(25) =37182145a(26) =37182145a(27) =37182145a(28) =1078282205a(29) =6469693230