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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 16 |
| 5 | 48 |
| 6 | 256 |
| 7 | 928 |
| 8 | 4288 |
| 9 | 16896 |
| 10 | 73728 |
| 11 | 301056 |
| 12 | 1283072 |
| 13 | 5318656 |
| 14 | 22446080 |
| 15 | 93634560 |
| 16 | 393543680 |
| 17 | 1646034944 |
| 18 | 6906380288 |
| 19 | 28918677504 |
| 20 | 121248940032 |
| 21 | 507934408704 |
| 22 | 2129004593152 |
| 23 | 8920531730432 |
| 24 | 37385660268544 |
| 25 | 156658714017792 |