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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 47 |
| 6 | 255 |
| 7 | 1727 |
| 8 | 14954 |
| 9 | 166232 |
| 10 | 2384053 |
| 11 | 44182143 |
| 12 | 1058142319 |
| 13 | 32718935706 |
| 14 | 1304369332319 |
| 15 | 66936884741385 |
| 16 | 4414855587293931 |