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 | 81 |
| 4 | 512 |
| 5 | 3046 |
| 6 | 17866 |
| 7 | 106133 |
| 8 | 649045 |
| 9 | 4125023 |
| 10 | 27378716 |
| 11 | 190102160 |
| 12 | 1380567060 |
| 13 | 10472967693 |
| 14 | 82843346443 |
| 15 | 682012236077 |
| 16 | 5832548494812 |
| 17 | 51723577104638 |
| 18 | 474868072764550 |
| 19 | 4506710508270721 |
| 20 | 44151990164554541 |