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 | 101 |
| 2 | 131 |
| 3 | 151 |
| 4 | 181 |
| 5 | 191 |
| 6 | 313 |
| 7 | 353 |
| 8 | 373 |
| 9 | 383 |
| 10 | 727 |
| 11 | 757 |
| 12 | 787 |
| 13 | 797 |
| 14 | 919 |
| 15 | 929 |
| 16 | 12101 |
| 17 | 14741 |
| 18 | 18181 |
| 19 | 32323 |
| 20 | 34543 |
| 21 | 35353 |
| 22 | 35753 |
| 23 | 72727 |
| 24 | 74747 |
| 25 | 75797 |
| 26 | 78787 |
| 27 | 79757 |
| 28 | 94949 |
| 29 | 95959 |
| 30 | 97579 |
| 31 | 1012321 |
| 32 | 1212121 |
| 33 | 1414741 |
| 34 | 1474141 |
| 35 | 1616161 |
| 36 | 3131353 |