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 | 3 |
| 2 | 4 |
| 3 | 10 |
| 4 | 10 |
| 5 | 31 |
| 6 | 31 |
| 7 | 126 |
| 8 | 126 |
| 9 | 571 |
| 10 | 571 |
| 11 | 2752 |
| 12 | 2752 |
| 13 | 14248 |
| 14 | 14248 |
| 15 | 73971 |
| 16 | 73971 |
| 17 | 389920 |
| 18 | 389920 |
| 19 | 2108414 |
| 20 | 2108414 |
| 21 | 11512078 |
| 22 | 11512078 |