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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 3 |
| 10 | 6 |
| 11 | 22 |
| 12 | 76 |
| 13 | 246 |
| 14 | 848 |
| 15 | 2889 |
| 16 | 9964 |
| 17 | 34440 |
| 18 | 119875 |
| 19 | 420525 |
| 20 | 1482802 |
| 21 | 5254679 |
| 22 | 18713933 |
| 23 | 66968081 |
| 24 | 240735712 |