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 | 5 |
| 3 | 49 |
| 4 | 529 |
| 5 | 7471 |
| 6 | 112825 |
| 7 | 2078455 |
| 8 | 42649281 |
| 9 | 997784221 |
| 10 | 25875851825 |
| 11 | 742641202183 |
| 12 | 23283999690561 |
| 13 | 793616663524231 |
| 14 | 29188521870580929 |
| 15 | 1152885848976064513 |
| 16 | 48659336030073207425 |
| 17 | 2185894865613157551481 |
| 18 | 104126348669497256201905 |
| 19 | 5242869988601103651841105 |