Number of subsets of {1..n} containing n such that it is not possible to choose a different prime factor of each element (non-choosable).

A370587

Number of subsets of {1..n} containing n such that it is not possible to choose a different prime factor of each element (non-choosable).

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =6a(5) =10a(6) =24a(7) =44a(8) =116a(9) =236a(10) =468a(11) =908a(12) =1960a(13) =3776a(14) =7812a(15) =15876a(16) =32504a(17) =63744a(18) =130104a(19) =257592a(20) =521152a(21) =1042976a(22) =2087096a(23) =4166408a(24) =8376816a(25) =16760832a(26) =33507744a(27) =67089280a(28) =134169440a(29) =268236928

External references