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 | 12 |
| 3 | 67 |
| 4 | 498 |
| 5 | 4701 |
| 6 | 54298 |
| 7 | 745734 |
| 8 | 11911221 |
| 9 | 217418722 |
| 10 | 4471886340 |
| 11 | 102454974993 |
| 12 | 2589782600870 |
| 13 | 71643147090159 |
| 14 | 2154145374733176 |
| 15 | 69981625464827605 |
| 16 | 2443741571641202568 |
| 17 | 91309620200404008348 |