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) |
|---|---|
| 5 | 0 |
| 6 | 168 |
| 7 | 107441 |
| 8 | 902774 |
| 9 | 3692732 |
| 10 | 11295174 |
| 11 | 28865676 |
| 12 | 65031988 |
| 13 | 133191360 |
| 14 | 253050012 |
| 15 | 452373900 |
| 16 | 768956436 |
| 17 | 1252803248 |
| 18 | 1968533980 |