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 | 1041 |
| 5 | 267552 |
| 6 | 274242081 |
| 7 | 1123570105392 |
| 8 | 18409696460431921 |
| 9 | 1206516278059945211200 |
| 10 | 316282209730469497179053121 |
| 11 | 331646250633753603369328903503952 |
| 12 | 1391025527264722227030105092707830630481 |
| 13 | 23337537123459992903665202300959789335795178848 |