Number of ordered triples of integers from [ 1..n ] with no global factor.

Terms

a(0) =1a(1) =3a(2) =8a(3) =15a(4) =29a(5) =42a(6) =69a(7) =95a(8) =134a(9) =172a(10) =237a(11) =287a(12) =377a(13) =452a(14) =552a(15) =652a(16) =804a(17) =915a(18) =1104a(19) =1252a(20) =1450a(21) =1635a(22) =1910a(23) =2106a(24) =2416a(25) =2674a(26) =3007a(27) =3301a(28) =3735a(29) =4027