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 | 0 |
| 2 | 7 |
| 3 | 55 |
| 4 | 616 |
| 5 | 19591 |
| 6 | 76167 |
| 7 | 515515 |
| 8 | 749947 |
| 9 | 7474747 |
| 10 | 72999927 |
| 11 | 236799997632 |
| 12 | 769437734967 |
| 13 | 1900289820091 |
| 14 | 2998954598992 |
| 15 | 5170703070715 |
| 16 | 5934592954395 |
| 17 | 29175111157192 |
| 18 | 51175166157115 |
| 19 | 57154688645175 |
| 20 | 211106050601112 |
| 21 | 570608929806075 |
| 22 | 574823545328475 |