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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 35 |
| 7 | 101 |
| 8 | 320 |
| 9 | 961 |
| 10 | 2703 |
| 11 | 6174 |
| 12 | 19905 |
| 13 | 35060 |
| 14 | 94614 |
| 15 | 235381 |
| 16 | 467754 |
| 17 | 776873 |
| 18 | 2498766 |
| 19 | 3281990 |
| 20 | 9917824 |
| 21 | 18735749 |
| 22 | 33417839 |
| 23 | 52251279 |
| 24 | 181365462 |
| 25 | 239569893 |