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 | 0 |
| 1 | 7 |
| 2 | 329 |
| 3 | 15456 |
| 4 | 726103 |
| 5 | 34111385 |
| 6 | 1602508992 |
| 7 | 75283811239 |
| 8 | 3536736619241 |
| 9 | 166151337293088 |
| 10 | 7805576116155895 |
| 11 | 366695926122033977 |
| 12 | 17226902951619441024 |
| 13 | 809297742799991694151 |
| 14 | 38019767008647990184073 |
| 15 | 1786119751663655546957280 |
| 16 | 83909608561183162716808087 |
| 17 | 3941965482623944992143022809 |