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) |
|---|---|
| 2 | 1 |
| 3 | 0 |
| 4 | 4 |
| 5 | 0 |
| 6 | 15 |
| 7 | 1 |
| 8 | 56 |
| 9 | 9 |
| 10 | 210 |
| 11 | 56 |
| 12 | 792 |
| 13 | 299 |
| 14 | 3003 |
| 15 | 1470 |
| 16 | 11441 |
| 17 | 6868 |
| 18 | 43776 |
| 19 | 31008 |
| 20 | 168151 |
| 21 | 136629 |
| 22 | 648208 |
| 23 | 591261 |
| 24 | 2507046 |
| 25 | 2523676 |
| 26 | 9726080 |
| 27 | 10656387 |
| 28 | 37839375 |
| 29 | 44612702 |
| 30 | 147600981 |
| 31 | 185477216 |
| 32 | 577147212 |
| 33 | 766744608 |
| 34 | 2261792303 |