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 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 7 |
| 7 | 12 |
| 8 | 30 |
| 9 | 64 |
| 10 | 177 |
| 11 | 457 |
| 12 | 1403 |
| 13 | 4327 |
| 14 | 15024 |
| 15 | 54730 |
| 16 | 219311 |
| 17 | 942908 |
| 18 | 4426513 |
| 19 | 22525015 |
| 20 | 124896794 |
| 21 | 752933593 |
| 22 | 4938212176 |
| 23 | 35190683416 |
| 24 | 272266028155 |
| 25 | 2284292635109 |