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 | 7 |
| 3 | 215 |
| 4 | 13823 |
| 5 | 1727999 |
| 6 | 373247999 |
| 7 | 128024063999 |
| 8 | 65548320767999 |
| 9 | 47784725839871999 |
| 10 | 47784725839871999999 |
| 11 | 63601470092869631999999 |
| 12 | 109903340320478724095999999 |
| 13 | 241457638684091756838911999999 |