Number of compositions of n into 3 ordered relatively prime parts.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =6a(5) =9a(6) =15a(7) =18a(8) =27a(9) =30a(10) =45a(11) =42a(12) =66a(13) =63a(14) =84a(15) =84a(16) =120a(17) =99a(18) =153a(19) =132a(20) =174a(21) =165a(22) =231a(23) =180a(24) =270a(25) =234a(26) =297a(27) =270a(28) =378a(29) =276