a(n) = Sum_{i|n, j|n, k|n} lcm(i,j,k).

Terms

a(0) =1a(1) =15a(2) =22a(3) =91a(4) =36a(5) =330a(6) =50a(7) =387a(8) =193a(9) =540a(10) =78a(11) =2002a(12) =92a(13) =750a(14) =792a(15) =1363a(16) =120a(17) =2895a(18) =134a(19) =3276a(20) =1100a(21) =1170a(22) =162a(23) =8514a(24) =511a(25) =1380a(26) =1192a(27) =4550a(28) =204a(29) =11880