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 | 0 |
| 2 | 6 |
| 3 | 66 |
| 4 | 222 |
| 5 | 252 |
| 6 | 282 |
| 7 | 414 |
| 8 | 444 |
| 9 | 474 |
| 10 | 606 |
| 11 | 636 |
| 12 | 666 |
| 13 | 696 |
| 14 | 828 |
| 15 | 858 |
| 16 | 888 |
| 17 | 2112 |
| 18 | 2442 |
| 19 | 2772 |
| 20 | 4224 |
| 21 | 4554 |
| 22 | 4884 |
| 23 | 6006 |
| 24 | 6336 |
| 25 | 6666 |
| 26 | 6996 |
| 27 | 8118 |
| 28 | 8448 |
| 29 | 8778 |
| 30 | 20202 |
| 31 | 20502 |
| 32 | 20802 |
| 33 | 21012 |
| 34 | 21312 |
| 35 | 21612 |
| 36 | 21912 |
| 37 | 22122 |
| 38 | 22422 |
| 39 | 22722 |
| 40 | 23232 |
| 41 | 23532 |
| 42 | 23832 |