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

Terms

a(0) =0a(1) =0a(2) =2a(3) =7a(4) =16a(5) =24a(6) =40a(7) =56a(8) =77a(9) =96a(10) =137a(11) =158a(12) =214a(13) =249a(14) =284a(15) =322a(16) =418a(17) =464a(18) =583a(19) =645a(20) =708a(21) =774a(22) =946a(23) =1007a(24) =1125a(25) =1220a(26) =1330a(27) =1420a(28) =1685a(29) =1768