Number of ordered triples of integers from [ 1,n ] with no common factors between pairs.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =14a(6) =26a(7) =33a(8) =46a(9) =52a(10) =84a(11) =91a(12) =137a(13) =152a(14) =174a(15) =199a(16) =279a(17) =295a(18) =397a(19) =425a(20) =475a(21) =513a(22) =663a(23) =692a(24) =819a(25) =876a(26) =986a(27) =1044a(28) =1286a(29) =1315