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 | 1 |
| 10 | 0 |
| 11 | 0 |
| 12 | 9 |
| 13 | 34 |
| 14 | 104 |
| 15 | 283 |
| 16 | 953 |
| 17 | 3029 |
| 18 | 9513 |
| 19 | 30359 |
| 20 | 98969 |
| 21 | 323646 |
| 22 | 1080659 |
| 23 | 3668432 |
| 24 | 12608491 |
| 25 | 43745771 |
| 26 | 153812801 |