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

Terms

a(0) =0a(1) =1a(2) =4a(3) =10a(4) =19a(5) =33a(6) =49a(7) =70a(8) =96a(9) =127a(10) =161a(11) =201a(12) =238a(13) =287a(14) =337a(15) =390a(16) =449a(17) =519a(18) =586a(19) =662a(20) =741a(21) =818a(22) =902a(23) =997a(24) =1095a(25) =1194a(26) =1299a(27) =1410a(28) =1518a(29) =1651