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 | 5 |
| 3 | 28 |
| 4 | 513 |
| 5 | 3126 |
| 6 | 840242 |
| 7 | 823544 |
| 8 | 8606711809 |
| 9 | 7625984905477 |
| 10 | 1221277338483250 |
| 11 | 285311670612 |
| 12 | 89215914432866222355906 |
| 13 | 302875106592254 |
| 14 | 316913110043605007120962336162 |
| 15 | 608295209422788113565012727970423808 |
| 16 | 680564733921105089459460296530789924865 |