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 | 2 |
| 2 | 14 |
| 3 | 268 |
| 4 | 19156 |
| 5 | 3961832 |
| 6 | 3092997464 |
| 7 | 7024809092848 |
| 8 | 60287817008722576 |
| 9 | 1505950784990730735392 |
| 10 | 142158530752430089391520224 |
| 11 | 39060769254069395008311334483648 |
| 12 | 40559566021977397260316290099710383936 |