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 | 5 |
| 2 | 60 |
| 3 | 670 |
| 4 | 7435 |
| 5 | 82460 |
| 6 | 914500 |
| 7 | 10141965 |
| 8 | 112476120 |
| 9 | 1247379290 |
| 10 | 13833648315 |
| 11 | 153417510760 |
| 12 | 1701426266680 |
| 13 | 18869106444245 |
| 14 | 209261597153380 |
| 15 | 2320746675131430 |
| 16 | 25737475023599115 |
| 17 | 285432971934721700 |
| 18 | 3165500166305537820 |