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

Terms

a(0) =1a(1) =14a(2) =22a(3) =93a(4) =44a(5) =308a(6) =74a(7) =472a(8) =259a(9) =616a(10) =158a(11) =2046a(12) =212a(13) =1036a(14) =968a(15) =2123a(16) =344a(17) =3626a(18) =422a(19) =4092a(20) =1628a(21) =2212a(22) =602a(23) =10384a(24) =1227a(25) =2968a(26) =2548a(27) =6882a(28) =932a(29) =13552