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 | 22 |
| 3 | 912 |
| 4 | 126692 |
| 5 | 56277344 |
| 6 | 78192313656 |
| 7 | 335781903409152 |
| 8 | 4424572027813470736 |
| 9 | 178044609358672673825280 |
| 10 | 21805611052892733414074516064 |
| 11 | 8108006645142880473904973170212864 |