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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 77 |
| 5 | 99 |
| 6 | 151 |
| 7 | 161 |
| 8 | 333 |
| 9 | 707 |
| 10 | 727 |
| 11 | 737 |
| 12 | 757 |
| 13 | 949 |
| 14 | 969 |
| 15 | 989 |
| 16 | 1441 |
| 17 | 1551 |
| 18 | 1771 |
| 19 | 1881 |
| 20 | 3003 |
| 21 | 7227 |
| 22 | 7667 |
| 23 | 7997 |
| 24 | 9009 |
| 25 | 9339 |
| 26 | 9999 |
| 27 | 10001 |
| 28 | 10101 |
| 29 | 10701 |
| 30 | 11111 |
| 31 | 11611 |
| 32 | 11711 |
| 33 | 12221 |
| 34 | 12921 |
| 35 | 13231 |
| 36 | 14341 |
| 37 | 14841 |
| 38 | 14941 |
| 39 | 15851 |
| 40 | 16661 |
| 41 | 16961 |
| 42 | 17071 |