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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 8 |
| 8 | 276 |
| 9 | 2774 |
| 10 | 59939 |
| 11 | 693696 |
| 12 | 13728106 |
| 13 | 180768774 |
| 14 | 3638322281 |
| 15 | 54074432712 |
| 16 | 1147607880440 |
| 17 | 19083350797374 |
| 18 | 432538009487375 |