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 | 3 |
| 1 | 49 |
| 2 | 462 |
| 3 | 3294 |
| 4 | 19715 |
| 5 | 104517 |
| 6 | 506646 |
| 7 | 2292310 |
| 8 | 9817920 |
| 9 | 40210800 |
| 10 | 158677370 |
| 11 | 606790410 |
| 12 | 2258770689 |
| 13 | 8214432303 |
| 14 | 29269938510 |
| 15 | 102434633406 |
| 16 | 352793077413 |
| 17 | 1197764971911 |
| 18 | 4014411070092 |