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 | 11 |
| 3 | 173 |
| 4 | 22931 |
| 5 | 1319183 |
| 6 | 233526463 |
| 7 | 2673857519 |
| 8 | 39959591850371 |
| 9 | 8797116290975003 |
| 10 | 4872532317019728133 |
| 11 | 1657631603843299234219 |
| 12 | 247098748783812523360613 |
| 13 | 77729277912104164732573547 |
| 14 | 1503342018433974345747514544039 |