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 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 3 |
| 9 | 11 |
| 10 | 33 |
| 11 | 95 |
| 12 | 260 |
| 13 | 696 |
| 14 | 1816 |
| 15 | 4659 |
| 16 | 11795 |
| 17 | 29520 |
| 18 | 73267 |
| 19 | 180485 |
| 20 | 442157 |
| 21 | 1077856 |
| 22 | 2617726 |
| 23 | 6336551 |
| 24 | 15299287 |
| 25 | 36857178 |
| 26 | 88635225 |
| 27 | 212829307 |
| 28 | 510416549 |
| 29 | 1222826994 |
| 30 | 2927083468 |
| 31 | 7001510693 |
| 32 | 16737477645 |