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) =20a(5) =35a(6) =50a(7) =72a(8) =100a(9) =129a(10) =163a(11) =203a(12) =244a(13) =290a(14) =346a(15) =400a(16) =461a(17) =526a(18) =600a(19) =676a(20) =756a(21) =836a(22) =925a(23) =1018a(24) =1117a(25) =1220a(26) =1325a(27) =1435a(28) =1554a(29) =1683