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 | 1 |
| 3 | 3 |
| 4 | 17 |
| 5 | 102 |
| 6 | 811 |
| 7 | 6626 |
| 8 | 58385 |
| 9 | 532251 |
| 10 | 5011934 |
| 11 | 48344880 |
| 12 | 475982471 |
| 13 | 4766639628 |
| 14 | 48434621610 |
| 15 | 498363430232 |
| 16 | 5184274255789 |
| 17 | 54451326151253 |
| 18 | 576810990484823 |
| 19 | 6156943228387305 |
| 20 | 66170786572330174 |
| 21 | 715564777086617766 |