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 | 3 |
| 2 | 27 |
| 3 | 747 |
| 4 | 41067 |
| 5 | 3669867 |
| 6 | 482671467 |
| 7 | 87660962667 |
| 8 | 21010450850667 |
| 9 | 6423384156578667 |
| 10 | 2439325392333218667 |
| 11 | 1126440053169940898667 |
| 12 | 621574841786409380258667 |
| 13 | 403913035968392044964258667 |