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 | 5 |
| 2 | 46 |
| 3 | 517 |
| 4 | 6376 |
| 5 | 82994 |
| 6 | 1119210 |
| 7 | 15475205 |
| 8 | 217994860 |
| 9 | 3115374880 |
| 10 | 45035696036 |
| 11 | 657153097330 |
| 12 | 9663914317396 |
| 13 | 143050882063262 |
| 14 | 2129448324373546 |
| 15 | 31853280798384645 |
| 16 | 478503774600509620 |
| 17 | 7215090439396842572 |
| 18 | 109154411037070011504 |
| 19 | 1656268648035559711392 |