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 | 9 |
| 3 | 56 |
| 4 | 705 |
| 5 | 19548 |
| 6 | 1419237 |
| 7 | 278474976 |
| 8 | 148192635483 |
| 9 | 213558945249402 |
| 10 | 836556995284293897 |
| 11 | 8962975658381123937708 |
| 12 | 264404516190234685662666051 |
| 13 | 21610417954162750247842392794292 |
| 14 | 4921335335427778307286708119839406529 |
| 15 | 3138313838161414849743136458064895837170596 |