Number of ordered triples (i,j,k) with |i|, |j|, |k|, |i*j*k| <= n.

Terms

a(0) =1a(1) =27a(2) =93a(3) =183a(4) =321a(5) =459a(6) =669a(7) =855a(8) =1121a(9) =1379a(10) =1685a(11) =1967a(12) =2393a(13) =2723a(14) =3125a(15) =3551a(16) =4049a(17) =4475a(18) =5045a(19) =5519a(20) =6137a(21) =6707a(22) =7301a(23) =7871a(24) =8681a(25) =9323a(26) =10013a(27) =10735a(28) =11545a(29) =12259