Number of 5-tuples of different integers from [ 2,n ] with no common factors among triples.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =3a(6) =6a(7) =21a(8) =36a(9) =111a(10) =142a(11) =336a(12) =463a(13) =725a(14) =965a(15) =1769a(16) =2060a(17) =3461a(18) =4156a(19) =5633a(20) =6846a(21) =10371a(22) =11585a(23) =16147a(24) =18924a(25) =23973a(26) =27508a(27) =37822a(28) =40704a(29) =54583