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 | 2 |
| 2 | 8 |
| 3 | 47 |
| 4 | 356 |
| 5 | 3252 |
| 6 | 34448 |
| 7 | 412546 |
| 8 | 5488222 |
| 9 | 80066096 |
| 10 | 1268400628 |
| 11 | 21651578958 |
| 12 | 395749634342 |
| 13 | 7705289481276 |
| 14 | 159106051976460 |
| 15 | 3471184678351602 |
| 16 | 79751883928130922 |
| 17 | 1924103020594546192 |
| 18 | 48622055377338993264 |