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 | 7 |
| 3 | 79 |
| 4 | 1021 |
| 5 | 15621 |
| 6 | 279931 |
| 7 | 5764795 |
| 8 | 134217721 |
| 9 | 3486784393 |
| 10 | 99999999991 |
| 11 | 3138428376711 |
| 12 | 106993205379061 |
| 13 | 3937376385699277 |
| 14 | 155568095557812211 |
| 15 | 6568408355712890611 |
| 16 | 295147905179352825841 |
| 17 | 14063084452067724990993 |