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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 10 |
| 5 | 21 |
| 6 | 55 |
| 7 | 182 |
| 8 | 357 |
| 9 | 1105 |
| 10 | 2958 |
| 11 | 16588 |
| 12 | 51243 |
| 13 | 106981 |
| 14 | 608685 |
| 15 | 3003455 |
| 16 | 7497910 |
| 17 | 52350909 |
| 18 | 168539462 |
| 19 | 1822961393 |
| 20 | 3079378759 |