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 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 36 |
| 5 | 110 |
| 6 | 366 |
| 7 | 1688 |
| 8 | 5312 |
| 9 | 24921 |
| 10 | 101495 |
| 11 | 417118 |
| 12 | 1673507 |
| 13 | 6081357 |
| 14 | 22843019 |
| 15 | 72935735 |
| 16 | 238112928 |
| 17 | 734665224 |
| 18 | 2185350505 |