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 | 2 |
| 2 | 1026 |
| 3 | 118100 |
| 4 | 62563330 |
| 5 | 20019531252 |
| 6 | 11393421713604 |
| 7 | 5550455033938152 |
| 8 | 3431955863873102850 |
| 9 | 2052124795850957537060 |
| 10 | 1367610300690018553312276 |
| 11 | 916694195766256069610158152 |
| 12 | 649630217578404016288230718276 |
| 13 | 467800319852823195772146025385000 |