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 | 0 |
| 2 | 1 |
| 3 | 16 |
| 4 | 418 |
| 5 | 17600 |
| 6 | 1086979 |
| 7 | 92223488 |
| 8 | 10292241540 |
| 9 | 1462309109760 |
| 10 | 257739952352133 |
| 11 | 55188518041440256 |
| 12 | 14111052911099343782 |
| 13 | 4246668467339066589184 |
| 14 | 1485904567816768099571207 |
| 15 | 598145009954138900489830400 |