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 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 45 |
| 6 | 339 |
| 7 | 6544 |
| 8 | 535619 |
| 9 | 392527477 |
| 10 | 7777266564708 |
| 11 | 21689055127418446258 |
| 12 | 101009204076980364695686091211 |