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 | 1 |
| 2 | 5 |
| 3 | 36 |
| 4 | 336 |
| 5 | 3863 |
| 6 | 52944 |
| 7 | 844777 |
| 8 | 15411547 |
| 9 | 316888806 |
| 10 | 7258887646 |
| 11 | 183464090374 |
| 12 | 5074934980977 |
| 13 | 152584140132667 |
| 14 | 4956824851572271 |
| 15 | 173086933804868142 |
| 16 | 6467223731119047195 |
| 17 | 257524741272166890188 |