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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 9 |
| 4 | 108 |
| 5 | 3645 |
| 6 | 354294 |
| 7 | 100442349 |
| 8 | 83682825624 |
| 9 | 205891132094649 |
| 10 | 1500946352969991210 |
| 11 | 32497439772059170685073 |
| 12 | 2093390532109442148854046084 |
| 13 | 401741006974223960704968343445877 |
| 14 | 229924845755649214047240549209929574046 |