Number of multisets {1^k1, 2^k2, ..., n^kn}, ki >= 0, with the sum of reciprocals <= 1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =17a(5) =37a(6) =86a(7) =199a(8) =475a(9) =1138a(10) =2769a(11) =6748a(12) =16613a(13) =40904a(14) =101317a(15) =251401a(16) =624958a(17) =1555940a(18) =3882708a(19) =9701790a(20) =24276866a(21) =60817940a(22) =152508653a(23) =382828565a(24) =961859364a(25) =2418662434a(26) =6086480305a(27) =15327208770a(28) =38622901484a(29) =97384378728