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 | 7 |
| 3 | 98 |
| 4 | 2096 |
| 5 | 60684 |
| 6 | 2221766 |
| 7 | 98488592 |
| 8 | 5129567208 |
| 9 | 307066395000 |
| 10 | 20775900638472 |
| 11 | 1567955813868960 |
| 12 | 130596146677118448 |
| 13 | 11899839375083061024 |
| 14 | 1177540373453616858240 |
| 15 | 125754589311488009416704 |
| 16 | 14416305655742615673941760 |
| 17 | 1765794816084642802179333120 |