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 | 2 |
| 2 | 3 |
| 3 | 12 |
| 4 | 118 |
| 5 | 9638 |
| 6 | 10622074 |
| 7 | 135037240786 |
| 8 | 18621890255342234 |
| 9 | 28688490385422625653266 |
| 10 | 511030957184968000138445253202 |