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 | 15 |
| 3 | 816 |
| 4 | 316251 |
| 5 | 873642672 |
| 6 | 17743125256857 |
| 7 | 2739097835911193328 |
| 8 | 3301626910467952067341626 |
| 9 | 31698997711344336177849363574320 |
| 10 | 2460103385023594223069956382123378560008 |