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 | 3 |
| 5 | 5 |
| 6 | 19 |
| 7 | 62 |
| 8 | 301 |
| 9 | 1413 |
| 10 | 7304 |
| 11 | 38294 |
| 12 | 208052 |
| 13 | 1149018 |
| 14 | 6466761 |
| 15 | 36899604 |
| 16 | 213245389 |
| 17 | 1245624985 |
| 18 | 7345962126 |
| 19 | 43688266206 |
| 20 | 261791220038 |
| 21 | 1579363550250 |
| 22 | 9586582997562 |
| 23 | 58513327318992 |
| 24 | 358957495385684 |
| 25 | 2212294939905234 |