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 | 3 |
| 3 | 19 |
| 4 | 225 |
| 5 | 3441 |
| 6 | 79259 |
| 7 | 2424195 |
| 8 | 94471089 |
| 9 | 4613520889 |
| 10 | 275148653115 |
| 11 | 19686730313955 |
| 12 | 1664382756757625 |