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 | 8 |
| 2 | 56 |
| 3 | 392 |
| 4 | 2688 |
| 5 | 18480 |
| 6 | 126672 |
| 7 | 868560 |
| 8 | 5953248 |
| 9 | 40806528 |
| 10 | 279692784 |
| 11 | 1917062784 |
| 12 | 13139773584 |
| 13 | 90061652352 |
| 14 | 617293135536 |
| 15 | 4231000268208 |
| 16 | 28999772127648 |