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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 8 |
| 7 | 17 |
| 8 | 38 |
| 9 | 88 |
| 10 | 212 |
| 11 | 530 |
| 12 | 1376 |
| 13 | 3693 |
| 14 | 10232 |
| 15 | 29231 |
| 16 | 85906 |
| 17 | 259291 |
| 18 | 802308 |
| 19 | 2540635 |
| 20 | 8220218 |
| 21 | 27134483 |
| 22 | 91258141 |
| 23 | 312324027 |
| 24 | 1086545705 |
| 25 | 3838581926 |