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 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 64 |
| 4 | 294 |
| 5 | 1346 |
| 6 | 6166 |
| 7 | 28242 |
| 8 | 129362 |
| 9 | 592538 |
| 10 | 2714096 |
| 11 | 12431808 |
| 12 | 56943398 |
| 13 | 260826950 |
| 14 | 1194707382 |
| 15 | 5472309246 |
| 16 | 25065693008 |
| 17 | 114812401444 |
| 18 | 525893599720 |
| 19 | 2408834540066 |
| 20 | 11033569993066 |
| 21 | 50538824799712 |
| 22 | 231491059896394 |
| 23 | 1060335514811206 |
| 24 | 4856824295820082 |
| 25 | 22246488881086116 |