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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 9 |
| 4 | 10 |
| 5 | 90 |
| 6 | 99 |
| 7 | 100 |
| 8 | 109 |
| 9 | 900 |
| 10 | 901 |
| 11 | 990 |
| 12 | 999 |
| 13 | 1000 |
| 14 | 1009 |
| 15 | 1090 |
| 16 | 9000 |
| 17 | 9001 |
| 18 | 9010 |
| 19 | 9900 |
| 20 | 9990 |
| 21 | 9999 |
| 22 | 10000 |
| 23 | 10009 |
| 24 | 10090 |
| 25 | 10099 |
| 26 | 10900 |
| 27 | 90000 |
| 28 | 90001 |
| 29 | 90010 |
| 30 | 90100 |
| 31 | 99000 |
| 32 | 99001 |
| 33 | 99900 |
| 34 | 99990 |
| 35 | 99999 |
| 36 | 100000 |
| 37 | 100009 |
| 38 | 100090 |
| 39 | 100099 |
| 40 | 100900 |
| 41 | 100901 |
| 42 | 100990 |
| 43 | 109000 |
| 44 | 900000 |
| 45 | 900001 |
| 46 | 900010 |
| 47 | 900100 |
| 48 | 901000 |
| 49 | 990000 |
| 50 | 990001 |
| 51 | 990010 |
| 52 | 995901 |
| 53 | 999000 |
[0,1,9,10,90,99,100,109,900,901,990,999,1000,1009, 1090,9000,9001,9010,9900,9990,9999,10000,10009, 10090,10099,10900,90000,90001,90010,90100,99000, 99001,99900,99990,99999,100000,100009,100090, 100099,100900,100901,100990,109000,900000,900001, 900010,900100,901000,990000,990001,990010,995901, 999000] |