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 | 6 |
| 2 | 41 |
| 3 | 306 |
| 4 | 2401 |
| 5 | 19326 |
| 6 | 157481 |
| 7 | 1290666 |
| 8 | 10606081 |
| 9 | 87262326 |
| 10 | 718359401 |
| 11 | 5915180706 |
| 12 | 48713027041 |
| 13 | 401185722606 |
| 14 | 3304124833001 |
| 15 | 27212740595226 |
| 16 | 224125017319681 |
| 17 | 1845905249384166 |
| 18 | 15202987455699881 |
| 19 | 125212786737489426 |