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 | 8 |
| 2 | 135 |
| 3 | 2574 |
| 4 | 51765 |
| 5 | 1072764 |
| 6 | 22664655 |
| 7 | 485325150 |
| 8 | 10495906641 |
| 9 | 228723580800 |
| 10 | 5014392953273 |
| 11 | 110471247622008 |
| 12 | 2443644577217025 |
| 13 | 54238301397083592 |
| 14 | 1207358254510786125 |
| 15 | 26943600312354592800 |
| 16 | 602594302548520646793 |
| 17 | 13502992968597378745800 |