a(n) = number of subsets of {1, 2, ..., n} that represent the first k divisors of m for some positive integers m and 1 <= k <= A000005(m).

A378314

a(n) = number of subsets of {1, 2, ..., n} that represent the first k divisors of m for some positive integers m and 1 <= k <= A000005(m).

Terms

    a(0) =0a(1) =1a(2) =2a(3) =4a(4) =6a(5) =12a(6) =16a(7) =28a(8) =36a(9) =52a(10) =70a(11) =118a(12) =150a(13) =246a(14) =318a(15) =382a(16) =430a(17) =670a(18) =798a(19) =1278a(20) =1566a(21) =1886a(22) =2270a(23) =3230a(24) =3742a(25) =4702a(26) =5854a(27) =6814a(28) =7966a(29) =11806

External references