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 | 11 |
| 2 | 19 |
| 3 | 101 |
| 4 | 109 |
| 5 | 191 |
| 6 | 199 |
| 7 | 911 |
| 8 | 919 |
| 9 | 991 |
| 10 | 1009 |
| 11 | 1019 |
| 12 | 1091 |
| 13 | 1109 |
| 14 | 1901 |
| 15 | 1999 |
| 16 | 9001 |
| 17 | 9011 |
| 18 | 9091 |
| 19 | 9109 |
| 20 | 9199 |
| 21 | 9901 |
| 22 | 10009 |
| 23 | 10091 |
| 24 | 10099 |
| 25 | 10111 |
| 26 | 10909 |
| 27 | 11119 |
| 28 | 11909 |
| 29 | 19001 |
| 30 | 19009 |
| 31 | 19919 |
| 32 | 19991 |
| 33 | 90001 |
| 34 | 90011 |
| 35 | 90019 |
| 36 | 90191 |
| 37 | 90199 |
| 38 | 90901 |
| 39 | 90911 |
| 40 | 91009 |
| 41 | 91019 |
| 42 | 91099 |
| 43 | 91199 |
| 44 | 91909 |
| 45 | 99109 |
| 46 | 99119 |
| 47 | 99191 |
| 48 | 99901 |
| 49 | 99991 |