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 | 231 |
| 5 | 64966 |
| 6 | 25235006 |
| 7 | 13560308427 |
| 8 | 9882496297869 |
| 9 | 9541326767381740 |
| 10 | 11933700898404327000 |
| 11 | 18952788279289054277077 |
| 12 | 37557776433732863957493587 |
| 13 | 91459873226296727634445511250 |
| 14 | 270065484482163804639566187885714 |
| 15 | 955675260646592652781867841662374079 |