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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 12 |
| 7 | 27 |
| 8 | 70 |
| 9 | 192 |
| 10 | 589 |
| 11 | 1825 |
| 12 | 5870 |
| 13 | 18952 |
| 14 | 62997 |
| 15 | 211014 |
| 16 | 718474 |
| 17 | 2468741 |
| 18 | 8578400 |