Differences between two positive cubes in exactly 2 ways.

Terms

a(0) =721a(1) =728a(2) =999a(3) =5768a(4) =5824a(5) =5859a(6) =7992a(7) =8911a(8) =9919a(9) =10621a(10) =12663a(11) =12824a(12) =19467a(13) =19656a(14) =23877a(15) =25669a(16) =26973a(17) =27937a(18) =28063a(19) =34209a(20) =35208a(21) =35929a(22) =41743a(23) =43561a(24) =46144a(25) =46592a(26) =46872a(27) =49959a(28) =53144a(29) =63936