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 | 3 |
| 2 | 36 |
| 3 | 27 |
| 4 | 6480 |
| 5 | 972 |
| 6 | 326592 |
| 7 | 34992 |
| 8 | 8398080 |
| 9 | 1259712 |
| 10 | 665127936 |
| 11 | 45349632 |
| 12 | 990435962880 |
| 13 | 1632586752 |
| 14 | 78364164096 |
| 15 | 58773123072 |
| 16 | 239794342133760 |
| 17 | 2115832430592 |
| 18 | 13507474236899328 |
| 19 | 76169967501312 |
| 20 | 201088714203463680 |