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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 41 |
| 3 | 207 |
| 4 | 1313 |
| 5 | 7807 |
| 6 | 42593 |
| 7 | 232463 |
| 8 | 1290433 |
| 9 | 7604415 |
| 10 | 42034721 |
| 11 | 236031231 |
| 12 | 1363681121 |
| 13 | 7457831007 |
| 14 | 39670144513 |
| 15 | 231087069823 |
| 16 | 1291433872385 |
| 17 | 7373001299199 |
| 18 | 41437235793921 |
| 19 | 229538650588863 |
| 20 | 1268719471103233 |