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 | 9 |
| 2 | -924 |
| 3 | -58049 |
| 4 | -1038576 |
| 5 | -9665625 |
| 6 | -59466176 |
| 7 | -272475249 |
| 8 | -973741824 |
| 9 | -2486784401 |
| 10 | 0 |
| 11 | 74062575399 |
| 12 | 938082635776 |
| 13 | 9862141508151 |
| 14 | 99710745345024 |
| 15 | 999423349609375 |
| 16 | 9998900488372224 |
| 17 | 99997984006099551 |
| 18 | 999996429532773376 |