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 | 0 |
| 3 | 15 |
| 4 | 219 |
| 5 | 2470 |
| 6 | 26185 |
| 7 | 266713 |
| 8 | 2658107 |
| 9 | 26198216 |
| 10 | 256516296 |
| 11 | 2501246232 |
| 12 | 24320647270 |
| 13 | 236032108530 |
| 14 | 2287868820615 |