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 | 4 |
| 2 | 4 |
| 3 | 4 |
| 4 | 198 |
| 5 | 30 |
| 6 | 102 |
| 7 | 3000 |
| 8 | 7332 |
| 9 | 4482 |
| 10 | 187218 |
| 11 | 150 |
| 12 | 114690 |
| 13 | 713310 |
| 14 | 1943532 |
| 15 | 3467622 |
| 16 | 4470420 |
| 17 | 23045178 |
| 18 | 12529818 |