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 | 2 |
| 2 | 6 |
| 3 | 72 |
| 4 | 1096 |
| 5 | 54726 |
| 6 | 4575512 |
| 7 | 969423130 |
| 8 | 418239229652 |
| 9 | 408299236290280 |
| 10 | 866521302130938818 |