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.
| n | a(n) |
|---|---|
| 1 | 19 |
| 2 | 90 |
| 3 | 99 |
| 4 | 109 |
| 5 | 901 |
| 6 | 902 |
| 7 | 909 |
| 8 | 1009 |
| 9 | 1019 |
| 10 | 1029 |
| 11 | 1091 |
| 12 | 1092 |
| 13 | 1099 |
| 14 | 1109 |
| 15 | 1209 |
| 16 | 1901 |
| 17 | 1902 |
| 18 | 1909 |
| 19 | 2019 |
| 20 | 2091 |
| 21 | 2109 |
| 22 | 2901 |
| 23 | 9001 |
| 24 | 9009 |
| 25 | 9011 |
| 26 | 9012 |
| 27 | 9019 |
| 28 | 9021 |
| 29 | 9091 |
| 30 | 9099 |
| 31 | 9101 |
| 32 | 9102 |
| 33 | 9109 |
| 34 | 9201 |
| 35 | 9901 |
| 36 | 9909 |
| 37 | 10009 |
| 38 | 10019 |
| 39 | 10029 |
| 40 | 10091 |
| 41 | 10092 |
| 42 | 10099 |