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

Terms

a(0) =1a(1) =3a(2) =9a(3) =18a(4) =51a(5) =72a(6) =176a(7) =264a(8) =447a(9) =586a(10) =1128a(11) =1362a(12) =2374a(13) =2943a(14) =3868a(15) =4841a(16) =7578a(17) =8633a(18) =12828a(19) =14847a(20) =18432a(21) =21480a(22) =30081a(23) =33223a(24) =43022a(25) =49051a(26) =59449a(27) =66796a(28) =87627a(29) =93688