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 | 1 |
| 2 | 10 |
| 3 | 12 |
| 4 | 24 |
| 5 | 615 |
| 6 | 4066 |
| 7 | 7960 |
| 8 | 30432 |
| 9 | 49260 |
| 10 | 133686 |
| 11 | 440286 |
| 12 | 1201644 |
| 13 | 6640812 |
| 14 | 126953125 |
| 15 | 411106256 |
| 16 | 1046704882 |
| 17 | 11046706752 |
| 18 | 44588839041 |