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 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 11 |
| 6 | 3 |
| 7 | 71 |
| 8 | 67 |
| 9 | 67 |
| 10 | 127 |
| 11 | 13 |
| 12 | 509 |
| 13 | 137 |
| 14 | 37 |
| 15 | 71471 |
| 16 | 71471 |
| 17 | 409993 |
| 18 | 941351 |
| 19 | 24419 |
| 20 | 287093 |
| 21 | 7147792819 |
| 22 | 110647261 |
| 23 | 80392811773 |
| 24 | 4716679469 |
| 25 | 4716679469 |
| 26 | 323905128133 |
| 27 | 8392290961 |
| 28 | 551615338229 |
| 29 | 34178276390953 |
| 30 | 73669621631 |