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 | 5 |
| 5 | 24 |
| 6 | 391 |
| 7 | 9549 |
| 8 | 401547 |
| 9 | 22597671 |
| 10 | 1646431048 |
| 11 | 149640359575 |
| 12 | 16597459048676 |
| 13 | 2206178465445432 |
| 14 | 346212403086248325 |
| 15 | 63333787189956042080 |
| 16 | 13359470726804093346852 |
| 17 | 3218846593376516669825536 |
| 18 | 878566295178157438213870011 |