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 | 4 |
| 2 | 11 |
| 3 | 29 |
| 4 | 87 |
| 5 | 317 |
| 6 | 1367 |
| 7 | 6644 |
| 8 | 35257 |
| 9 | 201152 |
| 10 | 1224225 |
| 11 | 7906794 |
| 12 | 53961576 |
| 13 | 387673853 |
| 14 | 2921972174 |
| 15 | 23036161619 |
| 16 | 189459483913 |
| 17 | 1621711095618 |
| 18 | 14416893342727 |
| 19 | 132860397599808 |
| 20 | 1267097654903284 |