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 | 17 |
| 2 | 273 |
| 3 | 4369 |
| 4 | 69905 |
| 5 | 1118481 |
| 6 | 17895697 |
| 7 | 286331153 |
| 8 | 4581298449 |
| 9 | 73300775185 |
| 10 | 1172812402961 |
| 11 | 18764998447377 |
| 12 | 300239975158033 |
| 13 | 4803839602528529 |
| 14 | 76861433640456465 |
| 15 | 1229782938247303441 |
| 16 | 19676527011956855057 |
| 17 | 314824432191309680913 |
| 18 | 5037190915060954894609 |