Number of nonempty subsets of {1, 2, ..., n} with <=7 pairwise coprime elements.

Terms

a(0) =1a(1) =3a(2) =7a(3) =11a(4) =23a(5) =27a(6) =55a(7) =71a(8) =103a(9) =115a(10) =231a(11) =247a(12) =495a(13) =543a(14) =615a(15) =727a(16) =1447a(17) =1511a(18) =2958a(19) =3148a(20) =3528a(21) =3782a(22) =7226a(23) =7473a(24) =10268a(25) =10969a(26) =13379a(27) =14163a(28) =25751a(29) =25998