a(n) = Sum_{k=1..n-1} lcm(lcm(n, k), lcm(n, n-k)).

Terms

a(0) =0a(1) =2a(2) =12a(3) =28a(4) =100a(5) =90a(6) =392a(7) =408a(8) =792a(9) =810a(10) =2420a(11) =1356a(12) =4732a(13) =3346a(14) =4560a(15) =6320a(16) =13872a(17) =7506a(18) =21660a(19) =12140a(20) =18900a(21) =21802a(22) =46552a(23) =22008a(24) =53000a(25) =43290a(26) =61668a(27) =49980a(28) =117740a(29) =48450