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) |
|---|---|
| 0 | 2 |
| 1 | 1 |
| 2 | 5 |
| 3 | 7 |
| 4 | 25 |
| 5 | 51 |
| 6 | 149 |
| 7 | 351 |
| 8 | 945 |
| 9 | 2347 |
| 10 | 6125 |
| 11 | 15511 |
| 12 | 40009 |
| 13 | 102051 |
| 14 | 262085 |
| 15 | 670287 |
| 16 | 1718625 |
| 17 | 4399771 |
| 18 | 11274269 |
| 19 | 28873351 |