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 | 4 |
| 2 | 16 |
| 3 | 68 |
| 4 | 256 |
| 5 | 1028 |
| 6 | 4112 |
| 7 | 7200 |
| 8 | 65536 |
| 9 | 262148 |
| 10 | 921600 |
| 11 | 1036800 |
| 12 | 1048592 |
| 13 | 16777472 |
| 14 | 88218000 |
| 15 | 371404800 |
| 16 | 418535784576 |