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 | 30 |
| 2 | 1730 |
| 3 | 152340 |
| 4 | 18177750 |
| 5 | 2742927876 |
| 6 | 500848449300 |
| 7 | 107365679361000 |
| 8 | 26431620161451750 |
| 9 | 7348772237141884500 |
| 10 | 2277376143931016207100 |
| 11 | 778374526612873263759000 |
| 12 | 290867891728117751744917500 |