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) |
|---|---|
| 1 | 0 |
| 2 | 1172 |
| 3 | 102952 |
| 4 | 5550469 |
| 5 | 436394066 |
| 6 | 32409609245 |
| 7 | 2441756629583 |
| 8 | 183384084351689 |
| 9 | 13794436866124300 |
| 10 | 1037425601212697006 |
| 11 | 78023920445683729803 |
| 12 | 5868131456816299629031 |
| 13 | 441338827948853709668453 |