Suspected divisor-or-multiple permutation of squarefree numbers: a(n) = A019565(A304533(n)).

Terms

a(0) =1a(1) =2a(2) =6a(3) =3a(4) =15a(5) =5a(6) =65a(7) =13a(8) =26a(9) =182a(10) =7a(11) =14a(12) =42a(13) =21a(14) =105a(15) =35a(16) =455a(17) =91a(18) =910a(19) =10a(20) =30a(21) =210a(22) =70a(23) =2730a(24) =39a(25) =78a(26) =546a(27) =273a(28) =1365a(29) =195