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 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 43 |
| 5 | 2291 |
| 6 | 6397 |
| 7 | 423953 |
| 8 | 2579419 |
| 9 | 30364247 |
| 10 | 77544004469 |
| 11 | 1277242663471 |
| 12 | 70250377083373 |
| 13 | 3909462041753561 |
| 14 | 101888460343995907 |
| 15 | 8217087542785091183 |
| 16 | 2455846588270412484317 |
| 17 | 38974424104246263663539 |