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 | -28 |
| 3 | -1187 |
| 4 | -6384 |
| 5 | 21875 |
| 6 | 720064 |
| 7 | 9176457 |
| 8 | 97902848 |
| 9 | 995217031 |
| 10 | 9990000000 |
| 11 | 99980512829 |
| 12 | 999964168192 |
| 13 | 9999937251483 |
| 14 | 99999894586496 |
| 15 | 999999829140625 |
| 16 | 9999999731564544 |
| 17 | 99999999589661327 |
| 18 | 999999999387779968 |