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 | 102 |
| 4 | 3384 |
| 5 | 4190874 |
| 6 | 3177012844 |
| 7 | 45913351929099 |
| 8 | 746140228341333064 |
| 9 | 140666601117969492988244 |