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 | 3 |
| 3 | 3 |
| 4 | 114 |
| 5 | 294 |
| 6 | 1674 |
| 7 | 5904 |
| 8 | 18596 |
| 9 | 60181 |
| 10 | 159875 |
| 11 | 452639 |
| 12 | 1297696 |
| 13 | 3515851 |
| 14 | 9840788 |
| 15 | 27100113 |
| 16 | 74045962 |
| 17 | 198875487 |
| 18 | 541400081 |