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 | 1 |
| 2 | 42 |
| 3 | 6006 |
| 4 | 204204 |
| 5 | 3879876 |
| 6 | 446185740 |
| 7 | 38818159380 |
| 8 | 2406725881560 |
| 9 | 89048857617720 |
| 10 | 3651003162326520 |
| 11 | 156993135980040360 |
| 12 | 51650741737433278440 |
| 13 | 2737489312083963757320 |
| 14 | 2737489312083963757320 |