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 | 1 |
| 2 | 8208 |
| 3 | 2391606 |
| 4 | 134218240 |
| 5 | 3051759375 |
| 6 | 39182085936 |
| 7 | 339111544828 |
| 8 | 2199023271936 |
| 9 | 11438396257005 |
| 10 | 50000000050000 |
| 11 | 189874916872146 |
| 12 | 641959232398848 |
| 13 | 1968688193035291 |
| 14 | 5556003413047920 |
| 15 | 14596463013075000 |