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 | 1 |
| 2 | 8 |
| 3 | 117 |
| 4 | 2800 |
| 5 | 97125 |
| 6 | 4551876 |
| 7 | 274975897 |
| 8 | 20690260928 |
| 9 | 1889451727497 |
| 10 | 205192914235300 |
| 11 | 26068434774065541 |
| 12 | 3822244304373085680 |
| 13 | 639508508456359098349 |
| 14 | 120922358829574588363364 |
| 15 | 25626415609908102483018225 |