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 | 1 |
| 1 | 6 |
| 2 | 52 |
| 3 | 600 |
| 4 | 8656 |
| 5 | 149856 |
| 6 | 3026752 |
| 7 | 69866880 |
| 8 | 1814338816 |
| 9 | 52350752256 |
| 10 | 1661575754752 |
| 11 | 57531530434560 |
| 12 | 2158011794968576 |
| 13 | 87173881613869056 |
| 14 | 3772959800981143552 |
| 15 | 174183372619165040640 |
| 16 | 8543978588021450407936 |
| 17 | 443748799382401230176256 |