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) |
|---|---|
| 3 | 1 |
| 4 | 0 |
| 5 | 5 |
| 6 | 1 |
| 7 | 21 |
| 8 | 8 |
| 9 | 84 |
| 10 | 45 |
| 11 | 330 |
| 12 | 221 |
| 13 | 1287 |
| 14 | 1015 |
| 15 | 5006 |
| 16 | 4488 |
| 17 | 19465 |
| 18 | 19380 |
| 19 | 75753 |
| 20 | 82365 |
| 21 | 295261 |
| 22 | 346104 |
| 23 | 1152944 |
| 24 | 1442101 |
| 25 | 4510830 |
| 26 | 5969561 |
| 27 | 17682795 |
| 28 | 24582663 |
| 29 | 69448446 |
| 30 | 100804436 |
| 31 | 273241161 |
| 32 | 411921832 |
| 33 | 1076832989 |