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 | 3 |
| 4 | 7 |
| 5 | 22 |
| 6 | 77 |
| 7 | 294 |
| 8 | 1054 |
| 9 | 3788 |
| 10 | 11326 |
| 11 | 24790 |
| 12 | 103641 |
| 13 | 164559 |
| 14 | 532510 |
| 15 | 1574252 |
| 16 | 2939898 |
| 17 | 4761009 |
| 18 | 21048218 |
| 19 | 24306306 |
| 20 | 95707819 |
| 21 | 205176450 |