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 | 1 |
| 3 | 2 |
| 4 | 13 |
| 5 | 145 |
| 6 | 157 |
| 7 | 1729 |
| 8 | 20737 |
| 9 | 20881 |
| 10 | 22477 |
| 11 | 248833 |
| 12 | 250705 |
| 13 | 269581 |
| 14 | 2985985 |
| 15 | 2987713 |
| 16 | 3234829 |
| 17 | 35831809 |
| 18 | 35854273 |
| 19 | 36080785 |
| 20 | 38817805 |
| 21 | 429981697 |
| 22 | 430002433 |
| 23 | 430232257 |
| 24 | 465813517 |
| 25 | 5159780353 |
| 26 | 5160049921 |
| 27 | 5195612305 |