Number of distinct products i*j*k with 1 <= i < j < k <= n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =10a(5) =16a(6) =29a(7) =42a(8) =60a(9) =75a(10) =111a(11) =126a(12) =177a(13) =206a(14) =238a(15) =274a(16) =361a(17) =396a(18) =507a(19) =554a(20) =613a(21) =677a(22) =838a(23) =883a(24) =1004a(25) =1092a(26) =1198a(27) =1277a(28) =1529a(29) =1590