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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 19 |
| 3 | 173 |
| 4 | 2001 |
| 5 | 28087 |
| 6 | 465011 |
| 7 | 8888889 |
| 8 | 192922993 |
| 9 | 4690709411 |
| 10 | 126370284195 |
| 11 | 3738060156613 |
| 12 | 120478742327009 |
| 13 | 4203359652212463 |
| 14 | 157854212399438371 |
| 15 | 6349779403743490289 |
| 16 | 272416890591642213921 |
| 17 | 12417347368421052631579 |