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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 1 |
| 7 | 0 |
| 8 | 3 |
| 9 | 12 |
| 10 | 18 |
| 11 | 12 |
| 12 | 15 |
| 13 | 72 |
| 14 | 180 |
| 15 | 240 |
| 16 | 235 |
| 17 | 512 |
| 18 | 1552 |
| 19 | 3080 |
| 20 | 4123 |
| 21 | 5810 |
| 22 | 13825 |
| 23 | 33200 |
| 24 | 58813 |
| 25 | 85932 |
| 26 | 151578 |
| 27 | 346920 |
| 28 | 726897 |
| 29 | 1242234 |
| 30 | 2025177 |
| 31 | 3952704 |
| 32 | 8509875 |
| 33 | 16525872 |
| 34 | 28565064 |
| 35 | 50849280 |
| 36 | 102266019 |
| 37 | 208932438 |
| 38 | 391951131 |
| 39 | 699037248 |
| 40 | 1313756457 |