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 | 4 |
| 3 | 32 |
| 4 | 192 |
| 5 | 1280 |
| 6 | 8192 |
| 7 | 53248 |
| 8 | 344064 |
| 9 | 2228224 |
| 10 | 14417920 |
| 11 | 93323264 |
| 12 | 603979776 |
| 13 | 3909091328 |
| 14 | 25300041728 |
| 15 | 163745628160 |
| 16 | 1059783180288 |
| 17 | 6859062771712 |
| 18 | 44392781971456 |
| 19 | 287316132233216 |
| 20 | 1859549040476160 |
| 21 | 12035254277636096 |
| 22 | 77893801758162944 |