Number of nonempty subsets of {1, 2, ..., n} with <=5 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) =225a(11) =241a(12) =450a(13) =496a(14) =565a(15) =663a(16) =1170a(17) =1227a(18) =2055a(19) =2196a(20) =2473a(21) =2666a(22) =4257a(23) =4420a(24) =5709a(25) =6122a(26) =7223a(27) =7664a(28) =11449a(29) =11612