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 | 2 |
| 4 | 2 |
| 5 | 5 |
| 6 | 5 |
| 7 | 18 |
| 8 | 16 |
| 9 | 75 |
| 10 | 64 |
| 11 | 405 |
| 12 | 302 |
| 13 | 2581 |
| 14 | 1693 |
| 15 | 19872 |
| 16 | 11295 |
| 17 | 175807 |
| 18 | 87524 |
| 19 | 1851135 |
| 20 | 787515 |
| 21 | 21909766 |
| 22 | 8185713 |
| 23 | 298698113 |
| 24 | 96514608 |
| 25 | 4538610230 |
| 26 | 1285072142 |