A023798 Xenodromes: all digits in base 3 are different.
0, 1, 2, 3, 5, 6, 7, 11, 15, 19, 21
Offset: 1
Programs
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Mathematica
FromDigits[#,3]&/@Flatten[Permutations/@Subsets[{0,1,2}],1]//Union (* Harvey P. Dale, Jul 29 2021 *)
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
FromDigits[#,3]&/@Flatten[Permutations/@Subsets[{0,1,2}],1]//Union (* Harvey P. Dale, Jul 29 2021 *)