[ Sum (s(j) - s(i))^3 ], 1 <= i < j <= n, where s(k) = 1 + 1/2 + ... + 1/k.

Terms

a(0) =0a(1) =0a(2) =2a(3) =4a(4) =9a(5) =15a(6) =22a(7) =33a(8) =45a(9) =60a(10) =78a(11) =98a(12) =121a(13) =147a(14) =177a(15) =209a(16) =245a(17) =284a(18) =326a(19) =372a(20) =422a(21) =475a(22) =531a(23) =592a(24) =656a(25) =723a(26) =795a(27) =871a(28) =950a(29) =1034