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 | 126 |
| 3 | 3501 |
| 4 | 46376 |
| 5 | 389376 |
| 6 | 2389752 |
| 7 | 11650752 |
| 8 | 47587752 |
| 9 | 168875127 |
| 10 | 534401002 |
| 11 | 1537404003 |
| 12 | 4080706128 |
| 13 | 10109274128 |
| 14 | 23590546128 |
| 15 | 52243162128 |
| 16 | 110473767504 |
| 17 | 224205418629 |
| 18 | 438589465254 |
| 19 | 830009446129 |
| 20 | 1524339072504 |
| 21 | 2724140666880 |
| 22 | 4748425291880 |
| 23 | 8089787666880 |