Number of ordered triples of integers from [ 2,n ] with no global factor.

Terms

a(0) =0a(1) =2a(2) =5a(3) =14a(4) =21a(5) =41a(6) =59a(7) =89a(8) =117a(9) =171a(10) =209a(11) =286a(12) =347a(13) =432a(14) =516a(15) =651a(16) =744a(17) =914a(18) =1042a(19) =1219a(20) =1382a(21) =1634a(22) =1806a(23) =2091a(24) =2323a(25) =2629a(26) =2895a(27) =3300a(28) =3562a(29) =4026