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 | 1 |
| 2 | 33 |
| 3 | 1097 |
| 4 | 54209 |
| 5 | 3527889 |
| 6 | 285356449 |
| 7 | 27608615257 |
| 8 | 3110179582593 |
| 9 | 399896866564001 |
| 10 | 57791843384031521 |
| 11 | 9273757516482276201 |
| 12 | 1636151050649025202753 |
| 13 | 314786007405793614831217 |
| 14 | 65590496972310741712688289 |
| 15 | 14714600180590751334321307769 |