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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 530 |
| 4 | 71196 |
| 5 | 18680148 |
| 6 | 8825763888 |
| 7 | 6969574132560 |
| 8 | 8223753750015600 |
| 9 | 14043461354695317600 |
| 10 | 33726601900489760438400 |