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 | 43 |
| 4 | 509 |
| 5 | 7579 |
| 6 | 135341 |
| 7 | 2813851 |
| 8 | 66733853 |
| 9 | 1778159275 |
| 10 | 52604224205 |
| 11 | 1711276244731 |
| 12 | 60729274013309 |
| 13 | 2335153500391627 |
| 14 | 96727188777453869 |
| 15 | 4294441686826824091 |
| 16 | 203456100846249179357 |
| 17 | 10245810557884742785387 |