Number of 6-element subsets of {1, 2, ..., n} having pairwise coprime elements.

Terms

a(0) =6a(1) =6a(2) =39a(3) =41a(4) =44a(5) =56a(6) =213a(7) =219a(8) =619a(9) =655a(10) =731a(11) =777a(12) =1853a(13) =1909a(14) =2775a(15) =2961a(16) =3707a(17) =3923a(18) =7803a(19) =7859a(20) =14308a(21) =15876a(22) =17437a(23) =18459a(24) =20865a(25) =21313a(26) =36080a(27) =38103a(28) =41568a(29) =42828