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 | 90 |
| 3 | 972 |
| 4 | 11016 |
| 5 | 128304 |
| 6 | 1516320 |
| 7 | 18055872 |
| 8 | 215830656 |
| 9 | 2584929024 |
| 10 | 30988915200 |
| 11 | 371685583872 |
| 12 | 4459138615296 |
| 13 | 53503133036544 |
| 14 | 641998414356480 |
| 15 | 7703745879785472 |
| 16 | 92443540002471936 |
| 17 | 1109314016699940864 |