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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 14 |
| 4 | 170 |
| 5 | 2904 |
| 6 | 74779 |
| 7 | 2751790 |
| 8 | 137080628 |
| 9 | 8882440224 |
| 10 | 726325289493 |
| 11 | 73173672616318 |
| 12 | 8906815805139614 |
| 13 | 1288823180820993752 |
| 14 | 218690604655001166063 |
| 15 | 43009037666992387906942 |
| 16 | 9705063652363696926178792 |
| 17 | 2490696756572714604529691648 |
| 18 | 721374035463654709543727643561 |