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 | 3 |
| 3 | 7 |
| 4 | 18 |
| 5 | 42 |
| 6 | 104 |
| 7 | 246 |
| 8 | 594 |
| 9 | 1416 |
| 10 | 3391 |
| 11 | 8084 |
| 12 | 19312 |
| 13 | 46041 |
| 14 | 109829 |
| 15 | 261827 |
| 16 | 624254 |
| 17 | 1487981 |
| 18 | 3546883 |
| 19 | 8453770 |
| 20 | 20149014 |
| 21 | 48021864 |
| 22 | 114451536 |
| 23 | 272769936 |
| 24 | 650084053 |
| 25 | 1549312743 |