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 | 2 |
| 1 | 0 |
| 2 | 4 |
| 3 | 8 |
| 4 | 232 |
| 5 | 448 |
| 6 | 18224 |
| 7 | 35424 |
| 8 | 1036064 |
| 9 | 2025472 |
| 10 | 130960832 |
| 11 | 257072000 |
| 12 | 689908475264 |
| 13 | 1358275350528 |
| 14 | 8031885897472 |
| 15 | 15847920983552 |
| 16 | 7981032500085248 |
| 17 | 15774370258485248 |
| 18 | 12448755354530366464 |