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 | 11 |
| 3 | 71 |
| 4 | 356 |
| 5 | 1866 |
| 6 | 10476 |
| 7 | 57186 |
| 8 | 308621 |
| 9 | 1682031 |
| 10 | 9170291 |
| 11 | 49879401 |
| 12 | 271409736 |
| 13 | 1477549796 |
| 14 | 8042157456 |
| 15 | 43769353716 |
| 16 | 238229560201 |
| 17 | 1296650911661 |
| 18 | 7057377605971 |
| 19 | 38411803629131 |
| 20 | 209067989511516 |