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 | 11 |
| 2 | 23 |
| 3 | 61 |
| 4 | 241 |
| 5 | 1201 |
| 6 | 7207 |
| 7 | 504001 |
| 8 | 4032029 |
| 9 | 36288017 |
| 10 | 362880043 |
| 11 | 3991680029 |
| 12 | 47900160013 |
| 13 | 622702080047 |
| 14 | 8717829120019 |
| 15 | 130767436800073 |
| 16 | 2092278988800037 |
| 17 | 35568742809600019 |
| 18 | 640237370572800041 |