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 | 6 |
| 2 | 84 |
| 3 | 936 |
| 4 | 9744 |
| 5 | 98976 |
| 6 | 995904 |
| 7 | 9983616 |
| 8 | 99934464 |
| 9 | 999737856 |
| 10 | 9998951424 |
| 11 | 99995805696 |
| 12 | 999983222784 |
| 13 | 9999932891136 |
| 14 | 99999731564544 |
| 15 | 999998926258176 |
| 16 | 9999995705032704 |
| 17 | 99999982820130816 |
| 18 | 999999931280523264 |
| 19 | 9999999725122093056 |
| 20 | 99999998900488372224 |