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 | 5 |
| 1 | 84 |
| 2 | 990 |
| 3 | 10010 |
| 4 | 92820 |
| 5 | 813960 |
| 6 | 6864396 |
| 7 | 56241900 |
| 8 | 450675225 |
| 9 | 3548173200 |
| 10 | 27536909400 |
| 11 | 211183061544 |
| 12 | 1603426948760 |
| 13 | 12070359895440 |
| 14 | 90193956545880 |
| 15 | 669621798598200 |
| 16 | 4943243777508855 |
| 17 | 36308086251336900 |
| 18 | 265483485367681350 |
| 19 | 1933360478165412450 |
| 20 | 14028103934595550800 |
| 21 | 101447684961932268960 |
| 22 | 731424072912190585200 |
| 23 | 5258854714114889362800 |