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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 15 |
| 6 | 38 |
| 7 | 133 |
| 8 | 446 |
| 9 | 1913 |
| 10 | 7492 |
| 11 | 36293 |
| 12 | 175904 |
| 13 | 953729 |
| 14 | 5053294 |
| 15 | 31353825 |
| 16 | 188697696 |
| 17 | 1268175779 |
| 18 | 8356974190 |
| 19 | 61775786301 |
| 20 | 448436391810 |
| 21 | 3579695446911 |
| 22 | 27848806031468 |
| 23 | 239229189529685 |
| 24 | 2019531300063238 |
| 25 | 18477179022470655 |
| 26 | 165744369451885256 |