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 | 11 |
| 2 | 205 |
| 3 | 3641 |
| 4 | 61681 |
| 5 | 1016801 |
| 6 | 16519105 |
| 7 | 266354561 |
| 8 | 4278255361 |
| 9 | 68585520641 |
| 10 | 1098438933505 |
| 11 | 17583600302081 |
| 12 | 281406274007041 |
| 13 | 4503049938657281 |
| 14 | 72053196259835905 |
| 15 | 1152886321308467201 |
| 16 | 18446462603027742721 |
| 17 | 295145653396718878721 |
| 18 | 4722348468539854946305 |