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 | 0 |
| 1 | 3 |
| 2 | 75 |
| 3 | 804 |
| 4 | 5988 |
| 5 | 36363 |
| 6 | 193827 |
| 7 | 943968 |
| 8 | 4303200 |
| 9 | 18652107 |
| 10 | 77701107 |
| 11 | 313483764 |
| 12 | 1231813812 |
| 13 | 4734541443 |
| 14 | 17859008379 |
| 15 | 66286569504 |
| 16 | 242605938720 |
| 17 | 877071559539 |
| 18 | 3136507851387 |
| 19 | 11108459253540 |
| 20 | 39002734461540 |
| 21 | 135876065474523 |
| 22 | 470021588191155 |
| 23 | 1615461644979264 |