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 | 4 |
| 4 | 8 |
| 5 | 18 |
| 6 | 44 |
| 7 | 117 |
| 8 | 351 |
| 9 | 1230 |
| 10 | 5069 |
| 11 | 25181 |
| 12 | 152045 |
| 13 | 1116403 |
| 14 | 9899865 |
| 15 | 104980369 |
| 16 | 1318017549 |
| 17 | 19427531763 |
| 18 | 333964672216 |
| 19 | 6660282066936 |