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 | 2 |
| 3 | 6 |
| 4 | 7 |
| 5 | 20 |
| 6 | 47 |
| 7 | 255 |
| 8 | 274 |
| 9 | 279 |
| 10 | 308 |
| 11 | 1162 |
| 12 | 2128 |
| 13 | 3791 |
| 14 | 9028 |
| 15 | 9629 |
| 16 | 10029 |
| 17 | 13202 |
| 18 | 38660 |
| 19 | 46631 |
| 20 | 48257 |