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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 6 |
| 5 | 42 |
| 6 | 43 |
| 7 | 18626 |
| 8 | 18627 |
| 9 | 5798368522871 |
| 10 | 5798368522872 |
| 11 | 194935493755610196550803104551677768964 |
| 12 | 194935493755610196550803104551677768965 |