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) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 465 |
| 4 | 13920 |
| 5 | 417121 |
| 6 | 12499696 |
| 7 | 374573745 |
| 8 | 11224712640 |
| 9 | 336366805441 |
| 10 | 10079779450576 |
| 11 | 302057016711825 |
| 12 | 9051630721904160 |
| 13 | 271246864640412961 |
| 14 | 8128354308490484656 |
| 15 | 243579382390074126705 |
| 16 | 7299253117393733316480 |
| 17 | 218734014139421925367681 |