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 | 1 |
| 2 | 0 |
| 3 | 3 |
| 4 | 1 |
| 5 | 16 |
| 6 | 18 |
| 7 | 95 |
| 8 | 154 |
| 9 | 581 |
| 10 | 1160 |
| 11 | 3752 |
| 12 | 8485 |
| 13 | 25208 |
| 14 | 61180 |
| 15 | 173343 |
| 16 | 438242 |
| 17 | 1210222 |
| 18 | 3134472 |
| 19 | 8538629 |
| 20 | 22437042 |
| 21 | 60690510 |
| 22 | 160889234 |
| 23 | 433701996 |
| 24 | 1156122902 |
| 25 | 3112018729 |
| 26 | 8325803356 |
| 27 | 22402792752 |
| 28 | 60084101129 |
| 29 | 161701735578 |