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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 12 |
| 5 | 21 |
| 6 | 102 |
| 7 | 120 |
| 8 | 201 |
| 9 | 210 |
| 10 | 123 |
| 11 | 132 |
| 12 | 213 |
| 13 | 231 |
| 14 | 312 |
| 15 | 321 |
| 16 | 1023 |
| 17 | 1032 |
| 18 | 1203 |
| 19 | 1230 |
| 20 | 1302 |
| 21 | 1320 |
| 22 | 2013 |
| 23 | 2031 |
| 24 | 2103 |
| 25 | 2130 |
| 26 | 2301 |
| 27 | 2310 |
| 28 | 3012 |
| 29 | 3021 |
| 30 | 3102 |
| 31 | 3120 |
| 32 | 3201 |
| 33 | 3210 |
| 34 | 1234 |
| 35 | 1243 |
| 36 | 1324 |
| 37 | 1342 |
| 38 | 1423 |
| 39 | 1432 |
| 40 | 2134 |
| 41 | 2143 |
| 42 | 2314 |
| 43 | 2341 |
| 44 | 2413 |
| 45 | 2431 |
| 46 | 3124 |
| 47 | 3142 |
| 48 | 3214 |
| 49 | 3241 |
| 50 | 3412 |
| 51 | 3421 |
| 52 | 4123 |
| 53 | 4132 |
| 54 | 4213 |
| 55 | 4231 |
| 56 | 4312 |
| 57 | 4321 |
[0,1,10,12,21,102,120,201,210,123,132,213,231,312, 321,1023,1032,1203,1230,1302,1320,2013,2031,2103, 2130,2301,2310,3012,3021,3102,3120,3201,3210,1234, 1243,1324,1342,1423,1432,2134,2143,2314,2341,2413, 2431,3124,3142,3214,3241,3412,3421,4123,4132,4213, 4231,4312,4321] |