Number of distinct products ijk with 0 <= i < j < k <= n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =5a(5) =11a(6) =17a(7) =30a(8) =43a(9) =61a(10) =76a(11) =112a(12) =127a(13) =178a(14) =207a(15) =239a(16) =275a(17) =362a(18) =397a(19) =508a(20) =555a(21) =614a(22) =678a(23) =839a(24) =884a(25) =1005a(26) =1093a(27) =1199a(28) =1278a(29) =1530