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 | 17 |
| 2 | 257 |
| 3 | 4477457 |
| 4 | 8503057 |
| 5 | 40960001 |
| 6 | 59969537 |
| 7 | 384160001 |
| 8 | 5802782977 |
| 9 | 58594980097 |
| 10 | 94197431057 |
| 11 | 102627966737 |
| 12 | 114733948177 |
| 13 | 283982410001 |
| 14 | 330123790097 |
| 15 | 381671897617 |
| 16 | 405519334417 |
| 17 | 691798081537 |
| 18 | 741637881857 |
| 19 | 1700843738897 |
| 20 | 1749006250001 |
| 21 | 2073600000001 |