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 | 6 |
| 3 | 23 |
| 4 | 84 |
| 5 | 283 |
| 6 | 930 |
| 7 | 2921 |
| 8 | 9096 |
| 9 | 27507 |
| 10 | 82930 |
| 11 | 244819 |
| 12 | 722116 |
| 13 | 2096603 |
| 14 | 6087290 |
| 15 | 17458887 |
| 16 | 50090544 |
| 17 | 142317089 |
| 18 | 404543142 |