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 | 1 |
| 3 | 19 |
| 4 | 1612 |
| 5 | 565276 |
| 6 | 734799976 |
| 7 | 3523103676184 |
| 8 | 63519230066936512 |
| 9 | 4400411105398828102336 |
| 10 | 1190433708177460323642937216 |
| 11 | 1270463865199882936737403300783744 |
| 12 | 5381067966904826663696685903449569172992 |
| 13 | 90765788839502187660342772995967835888789034496 |