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 | 27 |
| 2 | 8 |
| 3 | 771 |
| 4 | 1080 |
| 5 | 29540 |
| 6 | 79968 |
| 7 | 1241355 |
| 8 | 4807928 |
| 9 | 54733587 |
| 10 | 263068168 |
| 11 | 2491174972 |
| 12 | 13706830176 |
| 13 | 115900489291 |
| 14 | 694854606408 |
| 15 | 5473717429995 |
| 16 | 34661887488856 |
| 17 | 261125940394148 |
| 18 | 1712290280769888 |
| 19 | 12540109248690731 |
| 20 | 84080392667812248 |