Number of 5-tuples of different integers from [ 1,n ] with no common factors among pairs.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =2a(7) =3a(8) =6a(9) =6a(10) =32a(11) =33a(12) =105a(13) =114a(14) =128a(15) =157a(16) =385a(17) =400a(18) =831a(19) =886a(20) =1001a(21) =1076a(22) =2004a(23) =2074a(24) =2817a(25) =3022a(26) =3655a(27) =3880a(28) =6379a(29) =6449