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) |
|---|---|
| 1 | 3 |
| 2 | 6 |
| 3 | 222 |
| 4 | 444 |
| 5 | 888 |
| 6 | 21312 |
| 7 | 42624 |
| 8 | 468864 |
| 9 | 40322304 |
| 10 | 80644608 |
| 11 | 802494494208 |
| 12 | 213525880454088525312 |
| 13 | 213525880454088738837880454088525312 |