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 | 0 |
| 1 | 1 |
| 2 | 13 |
| 3 | 196 |
| 4 | 2925 |
| 5 | 43681 |
| 6 | 652288 |
| 7 | 9740641 |
| 8 | 145457325 |
| 9 | 2172119236 |
| 10 | 32436331213 |
| 11 | 484372848961 |
| 12 | 7233156403200 |
| 13 | 108012973199041 |
| 14 | 1612961441582413 |
| 15 | 24086408650537156 |
| 16 | 359683168316474925 |
| 17 | 5371161116096586721 |