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

Terms

a(0) =1a(1) =4a(2) =10a(3) =20a(4) =33a(5) =50a(6) =68a(7) =93a(8) =123a(9) =154a(10) =193a(11) =233a(12) =276a(13) =325a(14) =377a(15) =434a(16) =500a(17) =568a(18) =643a(19) =720a(20) =804a(21) =885a(22) =979a(23) =1068a(24) =1168a(25) =1274a(26) =1381a(27) =1495a(28) =1615a(29) =1746