Number of double-free integer partitions of n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =5a(6) =7a(7) =10a(8) =14a(9) =17a(10) =24a(11) =30a(12) =40a(13) =50a(14) =66a(15) =81a(16) =104a(17) =128a(18) =161a(19) =197a(20) =246a(21) =300a(22) =369a(23) =446a(24) =546a(25) =656a(26) =796a(27) =952a(28) =1148a(29) =1366