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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 4 |
| 9 | 24 |
| 10 | 92 |
| 11 | 292 |
| 12 | 850 |
| 13 | 2276 |
| 14 | 5766 |
| 15 | 13968 |
| 16 | 32690 |
| 17 | 74368 |
| 18 | 165442 |
| 19 | 361104 |
| 20 | 776116 |
| 21 | 1646566 |
| 22 | 3456030 |
| 23 | 7189232 |
| 24 | 14844878 |
| 25 | 30464914 |