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 | 4 |
| 4 | 10 |
| 5 | 25 |
| 6 | 64 |
| 7 | 158 |
| 8 | 405 |
| 9 | 1018 |
| 10 | 2580 |
| 11 | 6512 |
| 12 | 16435 |
| 13 | 41411 |
| 14 | 104280 |
| 15 | 262161 |
| 16 | 658763 |
| 17 | 1652954 |
| 18 | 4145802 |
| 19 | 10386103 |